求立体图形的体积.
35×(7×3)=35×7+35×3. .
计算下面各题,能简算的要写出简算过程.①6.72+2.08×4×1.5②12.56÷2.5÷0.4③2.85×4.7+28.5×0.53④9.88÷[5×(7.34﹣6.96)]⑤2.5×3.2×1.25⑥0.56×99.
计算下面各题,怎样简便怎样算.0.85×201 0.5×4.85×8 2.5×48﹣482.7+4.29+2.71+6.3 1.2×3.5+8.8×3.5.
能用简算的用简便算法计算,写出简算过程. 5.4×2.08﹣5.4×1.08 7.68×0.25×4 8.2×2.5+17.5 (12.4+16.8)÷0.4.
按要求计算(1)化简比①:0.75; ②分米:厘米(2)求未知数x①x:=51:17;②×7+4x=850%(3)简便计算①4.05﹣2.86﹣0.14;②7×0.6+0.4×7;③2.25×3.14×4+3.14;④(﹣)×17×5.