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1.8×6.5 4.2×1.5的简便计算

(a+b)+ c = a +(b+c) 1. 2.73 + 0.89 + 1.27 2. 4.37 + 0.28 + 1.63 + 5.72 a-b-c = a -(b+c) 1. 10 - 0.432 - 2.568 2. 9.3 - 5.26 - 2.74 3. 13.4-(3.4+5.2) 4. 14.9-(5.2+4.9) 5. 18.32 - 5.47 - 4....

=6.2-0.3*1.5 =6.2-0.45 =5.75

6.5×(3.6-1.8)简便计算 解:采用拆分法, 原式=6.5x1.8 =6.5x2x0.9 =13x0.9 =11.7

=0.5×5×0.6-1.8×0.5 =0.5×3-1.8×0.5 =0.5(3-1.8) =0.5×1.2 =0.6

2.6×0.6-1.8×0.5 =0.6x(2.6-0.5x3) =0.6x(2.6-1.5) =0.6x(1+0.1) =0.6+0.06 =0.66

2.5x0.6-1.8x0.5 =0.5×5×0.6-0.3×6×0.5 =0.5×3-0.3×3 =0.2×3 =0.6

6.5×1.8-1.84=9.86 回答完毕~~ 有疑问请追问,无疑问请点击【采纳】~ 祝学习进步~~~\(^o^)/~

x=1.8×6.5 x=11.7 将x带入原方程,等式成立方程就对了

先彩钠如何,我帮你解提这边谢谢。

6.2-54/100*100/180*5 =6.2-5*3/10 =6.2-1.5 =4.7

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