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4.2x0.5用简便算法

4.2×0.5 =4.2×(1/2) =2.1

请参考

4.2×0.5 =4.2×1/2 =4.2÷2 =2.1

42+5x=56 5x=56-42 5x=14 x=2.8

4.2*1.2-5.2*0.7 =0.7*6*1.2-5.2*0.7 =0.7*7.2-5.2*0.7 =0.7*(7.2-5.2) =0.7*2 =1.4

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

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

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。

只说方法,不给结果 (1.7x2.5x4.2)/(0.5x0.7x3.4)=1.7与3.4约分;2.5与0.5约分;4.2与0.7约分; 0.035x935+0.035+3x0.035+0.7x61x0.5=提取公因数0.035;0.7x0.5=0.035 20022003x20032002-20022002x20032003=(20022002+1)x20032002-20022002x(2...

等等我来。

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