Question

9×0.7+1.2×0.7-0.2×0.6简便方法？

Answer 1

9×0.7+11.2×0.7-0.2×0.6 等于0.7乘以括号内1.2+9括起来减去0.12等于0.7乘以10.2 再减去0.12等于 7.04-0.12 等于6点儿 92

Answer 2

把0.6变成0.7-0.1。那么掩饰就等于9×0.7+1.2×0.7-0.2×0.7+0.1×0.2。根据乘法分配律，提取0.7。就是0.7×（9+1.2-0.2）+0.02等于7+0.02。就是7.02。

Answer 3

这种题目的简便算法主要是找公因子，很明显9，1.2，0.6都有，公因子3。
3*（0.7+0.4*0.7-0.2*0.2）
=3*（0.7+0.28-0.04）
=3*0.58
=1.74

Answer 4

9*0.7+1.2*0.7-0.2*0.6
=0.7*（9+1.2）-0.2*0.6
=0.7*10.2-0.2*0.6
=7.14-0.12
=7.02

Answer 5

9×0.7+1.2×0.7-0.2×0.6
＝6.3+0.6×1.4-0.6×0.2
＝6.3+0.6×1.2
＝6.3+0.72
＝7.02
谁最终的结果是7.02