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4.2x0.5用简便算法

用4.2×5个0.1

4.2×0.5 =4.2×1/2 =4.2÷2 =2.1

请参考

4.2×(1-0.5)

5.8+4.2x0.5 =5.8+(4+0.2)x0.5 =5.8+2+0.1 =7.9

(1)4.2+0.5x=5.6, 4.2+0.5x-4.2=5.6-4.2, 0.5x=1.4, 0.5x÷0.5=1.4÷0.5, x=2.8;(2)x-35x=27, 25x=27, 25x÷25=27÷25, x=57;(3)x:514=21:58, 58x=514×21, 58x=152, 58x÷58=152÷58, x=12.

我估计你要算的是下面这个,W=MC△T 你确定不是答案错了? 资料上的标准答案也是人做的 人做出来的东东就有可能弄错的地方。

0.125X0.25X64 =0.125×0.25×8×4×2 =0.125×8×﹙0.25×4×2﹚ =1×2 =2 7.8X36+7.8X74-7又5分之4X10 =7.8×﹙36+74-10﹚ =7.8×100 =780 4.8X1/5+4.2÷5+1/5 =4.8×1/5+4.2×1/5+1/5 =1/5×﹙4.8+4.2+1﹚ =1/5×10 =2 9.3-3/2X10/21-2/7 = 9.3-5/7-2...

(4.2÷0.8一0.5)x0.2 =4.2÷4-0.1 =1.05-0.1 =0.95

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