0.027+9.9×0.027 怎样简算.
问题描述:
0.027+9.9×0.027 怎样简算.
答
0.027+9.9×0.027
=0.027×(1++9.9)
=0.027×(10+0.9)
=0.027×10+0.027×0.9
=0.27+0.0243
=0.2943我怎么弄不明白,,更糊涂了乘法分配律,正确啊