Question

7.4×0.19+0.26×1.9怎样简便运算？

Answer 1

可以运用乘法分配律。
7.4×0.19+0.26×1.9
=7.4×0.19+2.6×0.19
=(7.4+2.6)×0.19
=10×0.19
=1.9

Answer 2

这道题的简便计算方法是：7.4*0.19+0.26*1.9=0.74*1.9+0.26*1.9=（0.74+0.26）1.9=1.9。

Answer 3

此题有二种变法，其一是将7.4×0.19转换成0.74×1.9。其二是将0.26×1.9转换成2.6×0.19
解法一:7.4×0.19+0.26×1.9
=0.74×1.9+0.26×1.9
=(0.74+0.26)×1.9
=1×1.9
=1.9
解法二:7.4×0.19+0.26×1.9
=7.4×0.19+2.6×0.19
=(7.4+2.6)×0.19
=10×0.19
=1.9

Answer 4

7.4×0.19+0.26×1.9=（0.74+0.26）×1.9=1×1.9=1.9 根据乘法分配率

Answer 5

原式=7.4x1.9x0.1+2.6x0.1x1.9
=（7.4+2.6）x0.1x1.9
=10x0.1x1.9
=1.9
运用凑整和交换律，结合律化简更简单有效。