(1+0.23+0.34）*(0.23+0.34+0.78)-(1+0.23+0.34+0.78)
答案:1 悬赏:30 手机版
解决时间 2021-11-09 01:18
- 提问者网友：書生途
- 2021-11-08 14:43
(1+0.23+0.34）*(0.23+0.34+0.78)-(1+0.23+0.34+0.78)
最佳答案
- 五星知识达人网友：行雁书
- 2021-11-08 14:50
（1+0.23+0.34）*（0.23+0.34+0.78）-（1+0.23+0.34+0.78）*（0.23+0.34）
= {1+(0.23+0.34)}*（0.23+0.34+0.78）-{1+(0.23+0.34+0.78)}*（0.23+0.34）
= 1*(0.23+0.34+0.78)+(0.23+0.34)*(0.23+0.34+0.78) - 1 *(0.23+0.34) - (0.23+0.34+0.78)*(0.23+0.34)
= (0.23+0.34+0.78) - (0.23+0.34)
= 0.78追问看不懂追答乘法分配律：(A+B)*C = AC+BC追问哦
= {1+(0.23+0.34)}*（0.23+0.34+0.78）-{1+(0.23+0.34+0.78)}*（0.23+0.34）
= 1*(0.23+0.34+0.78)+(0.23+0.34)*(0.23+0.34+0.78) - 1 *(0.23+0.34) - (0.23+0.34+0.78)*(0.23+0.34)
= (0.23+0.34+0.78) - (0.23+0.34)
= 0.78追问看不懂追答乘法分配律：(A+B)*C = AC+BC追问哦
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