六年级总复习数学计算比赛 姓名 成绩 一.能简算的要简算。 (60 分)-先看运算顺序再看数据特点分析能否简算。1-( + ) ( ) 578-2981438 14 315 7+ 1200-197139576813 17 6136 + 2 2 25 97971369231520- 86 1999435859209 3( )43752115423(0.75- )( + ) 16.50.4+12.50.4+40%1639210.6-(6.6+0.12512.5%) 9.71.250.8 ( )24 ( )4165831116 813 1116 513二.解方程或比例: (24 分)要写解:6x+22.4=12 x = X+ X=26107363251+2x= 0.75: = :X X: =2.4:4355326581 = X: = X=9.04251x43817218X-25%X=1.2 15X= 0.7362x=1.5 65三、直接写得数。( 看清运算符号 )2-0.46= = 0.750.125= 26 = 438 13424 = 5= = 42=83751548251250.8= = - = - = 216341 = = 5.84.02= 5=233