0.64*25*7.8+2.2这道题用简便方法应该怎么做
答案:2 悬赏:80 手机版
解决时间 2021-11-24 19:07
- 提问者网友：沉默菋噵
- 2021-11-24 14:18
0.64*25*7.8+2.2这道题用简便方法应该怎么做
最佳答案
- 五星知识达人网友：旧脸谱
- 2021-11-24 15:35
0.64*25*7.8+2.2
=4×0.16×25×7.8+2.2
=（4×25）×0.16×7.8+2.2
=100×0.16×7.8+2.2
=16×7.8+2.2
=15×7.8+7.8+2.2
=15×（8-0.2）+10
=15×8-15×0.2+10
=120-3+10
=127
=4×0.16×25×7.8+2.2
=（4×25）×0.16×7.8+2.2
=100×0.16×7.8+2.2
=16×7.8+2.2
=15×7.8+7.8+2.2
=15×（8-0.2）+10
=15×8-15×0.2+10
=120-3+10
=127
全部回答
- 1楼网友：迷人又混蛋
- 2021-11-24 16:37
=0.16*(4*25)*7.8+2.22=0.16*100*7.8+2.2=16脳7.8+2.2=16脳2脳3.9+2脳1.1=2脳(16脳3.9+1.1)
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