Question

0.039+0.39.9×9.9能简便计算吗？

Answer 1

用乘法分配律简算
0.039+0.39×9.9
=0.39x0.1+0.39x9.9
=0.39x(0.1+9.9)
=0.39x10
=3.9
望采纳，谢谢

Answer 2

如果是0.039+0.39*9.9就可以，要不然0.39.9都不是个正常的数字没法计算。
0.039+0.39*9.9
=0.39*0.1+0.39*9.9
=0.39*(0.1+9.9)
=0.39*10=3.9

Answer 3

可以简便计算
0.039+0.39×9.9
=0.039+0.039×99
=0.039×（1+99）
=0.039×100
=3.9

Answer 4

解:原式=0.39×0.1+0.39×9.9
=0.39×(0.1+9.9)
=0.39×10=3.9

Answer 5

0.039+0.39×6.1+3.9×0.38
=0.39×0.1+0.39×6.1+0.39×3.8
=0.39×(0.1+6.1+3.8）
=0.39×10
=3.9