Question

脱式计算括号0.7×0.6+0点7×1.9+0点6×1.9括号乘2？

Answer 1

先按照乘法分配律，计算括号中的乘法：

0.7×0.6 = 0.42

0.7×1.9 = 1.33

0.6×1.9 = 1.14

然后将结果代入式子，继续计算：

0.7×0.6 + 0.7×1.9 + 0.6×1.9 = 0.42 + 1.33 + 1.14 = 2.89

最后乘以2，得到最终结果：

2.89×2 = 5.78

因此，答案为5.78。

Answer 2

（0.7×0.6+0.7×1.9+0.6×1.9）×2
=【0.7×（0.6+1.9）+0.6×1.9】×2
=0.7×2.5×2+（0.6×2-0.6×0.1）×2
=0.7×5+（1.2-0.06）×2
=3.5+1.2×2-0.06×2
=3.5+2.4-0.12
=5.9-0.12
=5.78