1、一站到底,七年级一班 “寓学于乐” 趣味活动,站神,规则介绍,每个小组先选出一名代表(各有初始分5分),然后随机抽号,1号为守擂者,其余为攻擂者,守擂者挑选一名攻擂者进行pk,直至分出胜负(攻擂者达到4人及以上时,守擂者有1次免答权, 2次求助权,可将不会做的题推给攻擂者,但视为用掉一次免答权,各攻擂者有1次求助权),告负者下场,由其组内其他人员上场替换,若无人上场视为弃权,若守擂者胜,他将获得与之pk攻擂者的分数,并继续挑战其他攻擂者;若攻擂者胜,他将成为新的守擂者。,规则介绍,只记当次比赛分数(比如守1胜攻1,但输攻2,其仍可获得攻1的5分,但其自己的初始分数要给攻2)若守擂者连续胜一轮,
2、除获得告负者分数外。额外奖励5分,若连续胜二轮,额外奖励10分。最终计算各小组总分。每两期评选出一名“战神”,并给得分最高的小组颁发奖状。,守擂者和攻擂者轮流答题,攻擂者先答题,答题时间为20秒,题目出现时开始计时,同时主持人将会朗读题目,方便参赛者答题,可以回答错误、但是没有在规定时间里回答出问题者失败。,先选人吧预备,现在开始!Now!,随机选题,什么叫正数?,大于0的数叫做正数,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,
3、过,在0.5、-2、-(+3)、0、-(-5)中,负数有哪些?,-2、-(+3),20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,什么叫一个数的绝对值?,一个数的绝对值就是表示这个数的点与原点的距离,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,在0.5、-|-
4、2|、-(+3)、-2-1,0、-(-5)中,非负数有哪些?,0.5、0、 -(-5),20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,有理数的概念?,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,整数和分数统称为有理数,如果上升米记作米,那么下降 米,记作多少
5、?,-12米,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,0不是( )A非负数 B正数 C自然数 D整数,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,B,什么叫单项式的次数?,一个单项式中,所有字母的指数的和叫做这个单项式的次数,20,19,18,17,1
6、6,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,什么叫同类项?,所含字母相同,并且相同字母的指数也分别相同的项叫做同类项(简称“二同”),20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,一个数的绝对值是4,则这个数是,20,19,18,17,16,15,14,13,12,11,10,9,8
7、,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,4或-4,数轴上与原点的距离为5的数是,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,5或-5,若a、b互为相反数,则可得到,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,
8、11,10,9,8,7,6,5,4,3,2,1,0,过,a+b=0,若a、b互为倒数,则可得到,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,ab=1,n棱柱有共有?个面;?条棱。,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,(n+2); 3n;,-2,20
9、,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,a=-3,b=1,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,设a、b互为相反数,c、d互为倒数,则2013(a+b)cd的值是_,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5
10、,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,-1,已知a、b互为相反数,c、d互为倒数,且 |m|=3,则 2a-4m2+2b-(-cd)2014的值为,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,-37,已知x=3是方程ax-6=a+10的解,则a=_,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5
11、,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,8,下午1点24分,时针与分针所组成的_度,102,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,5136=_,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6
12、,5,4,3,2,1,0,过,51.6,将130050000用科学记数法表示为,1.3005x108,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,在x2、(-x)2,(-a)2+1,|x|+2008,|a|,x+2008中,一定表示正数的有?,(-a)2+1,|x|+2008,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,1
13、3,12,11,10,9,8,7,6,5,4,3,2,1,0,过,m=4,n=2,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,已知代数式x2y的值是3,则代数式2x4y1的值是,7,多项式(2mx25x23x1)
14、 -(5x2-4y23x)化简后不含x2项,求m= ?,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,0,解方程5(x+8)5=6(2x7),x=11,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,1,20,19,18,17,16,15,14,13,12,11
15、,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,-12,2x与3x1互为相反数,则x=,1,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7
16、,6,5,4,3,2,1,0,过,25,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,4,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,单项式 -2x2y3 的系数是_,次数是_,-2,5,20,19,18,17,16,15,14,13,12,11,10,9,
17、8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,什么是一个几何体的三视图?,是指分别从左面、正上方、正前方看到的物体形状,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,有理数减法法则?,减去一个数,等于加上这个数的相反数,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20
18、,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,HL 的文字表达?,有斜边和一条直角边对应相等的两个直角三角形全等,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,三角形中位线定理 ?,三角形的中位线平行于第三边,并且等于它的一半,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,
19、14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,三角形中的中位线 ?,连接三角形两边中点的线段叫做三角形的中位线,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,n边形的内角和等于 ?,(n-2)180,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2
20、,1,0,过,任意多边形的外角和等于?,360,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,平行四边形的判定方法(至少3种)?,(1)两组对边分别平行的四边形(2)两组对角分别相等的四边形(3)两组对边分别相等的四边形(4)对角线互相平分的四边形(5)一组对边平行且相等的四边形,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,
21、13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,有理数乘法法则 ?,两数相乘,同号得正,异号得负,并把绝对值相乘。任何数与0相乘,积仍为0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,矩形的判定方法(至少说2种)?,(1)有一个角是直角的平行四边形是矩形(2)有三个角是直角的四边形是矩形(3)对角线相等的平行四边形是矩形,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5
22、,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,菱形具有哪些性质(至少说3条)?,(1)具有平行四边形的一切性质(2)菱形的四条边相等(3)菱形的对角线互相垂直,并且每一条对角线平分一组对角,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,菱形的判定方法(至少说2条)?,(1)有一组邻边相等的平行四边形是菱形(2)四边都相等的四边形是菱形(3)对
23、角线互相垂直的平行四边形是菱形,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,有理数除法法则 ?,两个有理数相除,同号得正,异号得负,并把绝对值相除。除以一个数等于乘以这个数的倒数0除以任何非0的数都得0。,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,什么叫
24、方程的解?,能使方程左右两边相等的未知数的值叫做方程的解,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,等式的性质1,等式的两边同时加上(或减去)同一个代数式,所得结果仍然成立。,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,解一元一次方程的一般步骤:,(1)
25、去分母(2)去括号(3)移项(把方程中的某一项改变符号后,从方程的一边移到另一边,这种变形叫移项)(4)合并同类项(5)化系数为1,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,等式的性质2,等式的两边同时乘以同一个数(或除以同一个不为0的数),所得结果成立,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10
26、,9,8,7,6,5,4,3,2,1,0,过,半圆(或直径)所对的圆周角是多少度 ?,90,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,90的圆周角所对的弦是?,直径,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,直角三角形斜边上的中线等于?,斜边的一半,2
27、0,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,n的圆心角所对的弧长l的计算公式为 ?,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,扇形面积公式 ?,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,
28、19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,圆锥的侧面积公式?,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,下列各数中,无理数有?,甜酸苦辣咸,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,过,活动结束,谢谢参与 Thank you!,