6.9x0,45+2.9x0.42+2.9x0.13怎么算?
答案:1 悬赏:60 手机版
解决时间 2021-11-27 09:12
- 提问者网友:心牵心
- 2021-11-26 17:45
6.9x0,45+2.9x0.42+2.9x0.13怎么算?
最佳答案
- 五星知识达人网友:往事隔山水
- 2021-11-26 19:17
=6.9*0.45+2.9*(0.42+0.13)
=6.9*.45+2.9*0.55
=2.9*0.45+4*0.45+2.9*0.55
=1.8+2.9*1
=4.7
=6.9*.45+2.9*0.55
=2.9*0.45+4*0.45+2.9*0.55
=1.8+2.9*1
=4.7
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