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4.2x0.5用简便算法

4.2×0.5 =4.2×1/2 =4.2÷2 =2.1

请参考

4.2×3.5+5.5×0.32 =(4+0.20)x3.5+5.5x(0.3+0.02) =4x3.5+0.2x3.5+5.5x0.3+5.5x0.02 =14+0.7+1.65+0.11 =14.7+1.65+0.11 =16.46 祝学习进步。

(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.

0.5×(4.2-0.8)-0.45 =0.5×(4.2-0.8)-0.5×0.9 =0.5×(4.2-0.8-0.9) =0.5×2.5 =1.25

4.2x1.3+2.7x0.5 =3x(1.4x1.3+0.9x0.5) =3x(1.82+0.45) =3x2.27 =3x3-3x0.73 =9-2.19 =6.81

4.2×2.3÷0.35 =0.7×6×2.3÷0.7÷0.5 =(0.7÷0.7)×(6×2.3×2)÷(0.5×2) =1×6×4.6÷1 =6×(5-0.4) =6×5-6×0.4 =30-2.4 =27.6

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

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...

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。

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