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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....

原式等于 11.7+6.3=18 所以原式的计算结果为18.

6.5×6+1.5×4 =6.5x6+6 =6x(6.5+1) =3x2x7.5 =3x15 =45

题目真看不懂啊,你没打错吧,为什么23.5和6.5之间没有符号呢

1.5-0.9=0.6

2.08×60 =2*60+0.08*60 =120+4.8 =124.8 ,2.5×0.6-1.8×0.5 =1.5-0.9 =0.6

9/5×11.6+ 1.8×18.4怎样简便计算 =1.8×(11.6+18.4) =1.8×30 =54

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

原式 =9/5x11.6+1.8x18.4 =1.8x11.6+1.8x18.4 =1.8x(11.6+18.4) =1.8x30 =54 供参考。

3.29+0.73+2.27 3.29-0.73-2.27 7.5+2.5-7.5+2.5 7.325-3.29-3.325 7.325-(5.325+1.7) 7.325-(5.325-1.7) 3.29+0.73-2.29+2.27 3.29×0.25×4 0.125×8.8 0.25×0.28 0.125×3.2×2.5 35×40.2 0.25×4÷0.25×4 3.5×9.9 3.5×99+3.5 3.5×101-3.5 3.5×9.9+3...

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