43×47+57×37+57能简便远算吗?如果能,应该怎样简便计算?
答案:5 悬赏:20 手机版
解决时间 2021-02-21 20:50
- 提问者网友:富士山上尢
- 2021-02-21 11:18
43×47+57×37+57能简便远算吗?如果能,应该怎样简便计算?
最佳答案
- 五星知识达人网友:七十二街
- 2021-02-21 12:09
能简便的了。
解:43X47+57X37+57
=43X47+(47+10)(47--10)+57
=43X47+47^2--10^2+57
=47(43+47)--100+57
=47X90--43
=4230--43
=4187。
解:43X47+57X37+57
=43X47+(47+10)(47--10)+57
=43X47+47^2--10^2+57
=47(43+47)--100+57
=47X90--43
=4230--43
=4187。
全部回答
- 1楼网友:千杯敬自由
- 2021-02-21 14:41
可以简化解:
43×47+57×37+57
=43×(57-10)+57×37+57
=43×57-43x10+57×37+57
=43×57+57×37+57-43x10
=57x(43+37)+57-43x10
=57x80-43x10+57
=4560-430+57
=4130+57
=4187
43×47+57×37+57
=43×(57-10)+57×37+57
=43×57-43x10+57×37+57
=43×57+57×37+57-43x10
=57x(43+37)+57-43x10
=57x80-43x10+57
=4560-430+57
=4130+57
=4187
- 2楼网友:英雄的欲望
- 2021-02-21 14:23
原式=(47-4)*47+(47+10)*(47-10)+47+10
=2*47^2-3*47-90
=(2*47-1)*(47-1)-91
=93*46-91
=93*45+2
=4187
应该够简化了吧~
=2*47^2-3*47-90
=(2*47-1)*(47-1)-91
=93*46-91
=93*45+2
=4187
应该够简化了吧~
- 3楼网友:酒醒三更
- 2021-02-21 13:05
43×47+57×37+57
=(100-57)×47+57×37+57
=4700-57×(47-37)+57
=4700-570+57
=4187
=(100-57)×47+57×37+57
=4700-57×(47-37)+57
=4700-570+57
=4187
- 4楼网友:十年萤火照君眠
- 2021-02-21 12:54
解:
43×47+57×37+57
=43×(57-10)+57×37+57
=43×57-43x10+57×37+57
=43×57+57×37+57-43x10
=57x(43+37)+57-43x10
=57x80-43x10+57
=4560-430+57
=4130+57
=4187
43×47+57×37+57
=43×(57-10)+57×37+57
=43×57-43x10+57×37+57
=43×57+57×37+57-43x10
=57x(43+37)+57-43x10
=57x80-43x10+57
=4560-430+57
=4130+57
=4187
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