河北省石家庄市井陉矿区贾庄镇学区2017_2018学年八年级数学上学期开学考试试题（无答案）冀教版.doc

1、 2017-2018 12 2 24 1 1 A B C D 1 ( ) 2 0 3 ) 2 ( 2 b a 2007 b a A 0 B 1 C 1 D 2007 3 ABC ABC ACB I ABC ACB=100 BIC A. 80 B. 50 C. 100 D. 130 4 A y x y x 5 2 3B 3x+1=2xy C 5 1 x=y 2 +1 D x+y=1 5 AB CD B D E A B+ D+ E=90 B B+ D+ E=180 C B= E D D B- D= E 6 ABC 1 2010 A.2009 B.2010 C.4020 D.4021 7 2 1 x

2、 x x A.x 0 B x 1 C.x -1 D.x 1 8 8 b a ab ab 22 xy xy 22 xy xy E D C B AC A B 1 A 1 B 2 C 3 D 4 9 8 79 a ab a, b 5 A. 5 B. 5 C. 8 D. 10 1 2 1 1 2 x x 0 x A 1 B 1 C 2 D 2 111 A a+a 3 = a 1+a 2 B 2a 4b+2=2 a 2b C a 2 4= a 2 2D a 2 2a+1= a 1 212 ABCD EF DE BF P BPE PEF A B C D 3 18 13 3 5 a 2 5 b b a 3

3、2 5 =_ 14 4 b a 10 2 2 b a 2 ) ( b a _ 15 x 1 1 x 1 3 x 1 2 _ 16 1 4 _ 17 b a ab 2 n 9 mn 6 m 2 2 x 2 kx+9 k 18 1+2+2 2 +2 3 2012 S=1+2+2 2 +2 3 2012 2S=2+2 2 +2 3 +2 4 2013 2S S=2 2013 1 1+5+5 2 +5 3 2012 . 10 B C A D E 58 19 4 8 1 3x 2 6xy 3y 2 2 81(a b) 2 16(a b) 2 20 8 ABC B=40 BCD=100 EC ACB A ACE 21 5 10 1 2 2 3 1 46 yy 2 3 4 9 23 xy xy 22 8 1 2 B D ABC ADC 23 8 mn n mn m n m 2 2 2 ) 1 1 ( m= 3 n=5 24 8 x=3,8.7, 7 11 2 2 2 1 2 2 11 x x x xx A 1 B D 2 C 25 ( 8 ) W 2 3 60 2 6 40 x / y / 1 y x 2 W 3 W 30 a b a b