1、六年级数学口算练习1、直接写出得数: 7 = 6 = = 0=314 67 45 54 37 783 = 52 = + = = = 13 413 45 3415 18 52 37 78 12 13 = 1 76.2 1 13 12 72 421 34 109 2.5 = = 56 512 79 928 45 35 59 18 18 57 8516 = = 1 = = 9 = 33= 1-34 23 34 25 12 23 34 111525%= 75%+0.25= = - = = 3= 38 314 1315 3456 13 = 2= 5 5= 9 = 542345 67 5656 13 23
2、2.7 = 6 = ( 1.6 3.2) 0.125= 910 5120.10.01 1 0.245 448 0.770.33= 1.681.5= 71.4= 9 = 278292.61.7 = 2 = 32530 = 7= (0.18 13 13 230.9)9 = 看谁的方法最巧妙:1-( + ) ( ) 1438 14 3511395767+ 9 2 813 17 613 972- - + 9 - 74 110 910 713 49 713 59 67 76 1977 6( 23) 88 17 17 17 34 14 188( ) ( ) 13232535 1215563445 【 ( ) 】 79152951 123435 7101( ) ( - ) 3 34 112 32 67 35 95 4259 ( )( )54218 ( ) 34123185353、解方程: 6x+4.8=12 15x3=60 X X 35 892X 4x+x=3.15 0.7362x=1.5 x-0.35x=3.25 34 18x+8=122 x-0.35x=3.25 x+8=122 X = 23 23 57514787.2 2X=3.8 X X=1523162.化简 下 面 各 比 ,并 求 出 比 值 : 15 0.8: 1.5:58 34 35