(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少
答案:3 悬赏:40 手机版
解决时间 2021-11-08 20:00
- 提问者网友:雨不眠的下
- 2021-11-08 15:46
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34的简便算是多少
最佳答案
- 五星知识达人网友:人间朝暮
- 2021-11-08 16:02
1、这道题要用“假设法”来做。
2、假设:1+0.23+0.34=a; 0.23+0.34=b;
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=a×(b+0.65)-(a+0.65)×b
=ab+0.65a-ab-0.65b
=0.65×(a-b)…………因为:a=1+0.23+0.34;b=0.23+0.34
=0.65×(1+0.23+0.34-0.23-0.34)
=0.65×1
=0.65
2、假设:1+0.23+0.34=a; 0.23+0.34=b;
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=a×(b+0.65)-(a+0.65)×b
=ab+0.65a-ab-0.65b
=0.65×(a-b)…………因为:a=1+0.23+0.34;b=0.23+0.34
=0.65×(1+0.23+0.34-0.23-0.34)
=0.65×1
=0.65
全部回答
- 1楼网友:鸠书
- 2021-11-08 17:20
令A=0.23+0.34=0.57
式子=(1+A)*(A+0.65)-(1+A+0.65)*A
=A+A2+0.65A+0.65-A-A2-0.65A
=0.65
式子=(1+A)*(A+0.65)-(1+A+0.65)*A
=A+A2+0.65A+0.65-A-A2-0.65A
=0.65
参考资料:本人
- 2楼网友:第幾種人
- 2021-11-08 16:28
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=(0.23+0.34+0.65)+(0.23+0.34)*(0.23+0.34+0.65)-(0.23+0.34)-(0.23+0.34)(0.23+0.34+0.65)
=0.65
=(0.23+0.34+0.65)+(0.23+0.34)*(0.23+0.34+0.65)-(0.23+0.34)-(0.23+0.34)(0.23+0.34+0.65)
=0.65
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