(1/11+1/21+1/31+1/41)乘(1/21+1/31+1/41+1/51)-(1/11+1/21+1/
答案:2 悬赏:30 手机版
解决时间 2021-01-16 17:21
- 提问者网友:ミ烙印ゝ
- 2021-01-16 02:59
(1/11+1/21+1/31+1/41)乘(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+1/51)乘(1/21+1/31+1/41
最佳答案
- 五星知识达人网友:山河有幸埋战骨
- 2021-01-16 04:15
令a=1/21+1/31+1/41
原式=(1/11+a)(a+1/51)-(1/11+a+1/51)a
=(1/11+a)a+1/51*(1/11+a)-(1/11+a)a-1/51a
=1/51*(1/11+a)-1/51a
=1/51*1/11+1/51a-1/51a
=1/561
原式=(1/11+a)(a+1/51)-(1/11+a+1/51)a
=(1/11+a)a+1/51*(1/11+a)-(1/11+a)a-1/51a
=1/51*(1/11+a)-1/51a
=1/51*1/11+1/51a-1/51a
=1/561
全部回答
- 1楼网友:北城痞子
- 2021-01-16 05:07
(1/11+1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+/51)*(1/21+1/31+1/41)
=【1/11+(1/21+1/31+1/41)】*(1/21+1/31+1/41+1/51)-【1/11+(1/21+1/31+1/41+/51)】*(1/21+1/31+1/41)
=1/11*(1/21+1/31+1/41+1/51)+(1/21+1/31+1/41)(1/21+1/31+1/41+1/51)-1/11*(1/21+1/31+1/41)-(1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)
=1/11*(1/51)=1/561
=【1/11+(1/21+1/31+1/41)】*(1/21+1/31+1/41+1/51)-【1/11+(1/21+1/31+1/41+/51)】*(1/21+1/31+1/41)
=1/11*(1/21+1/31+1/41+1/51)+(1/21+1/31+1/41)(1/21+1/31+1/41+1/51)-1/11*(1/21+1/31+1/41)-(1/21+1/31+1/41)*(1/21+1/31+1/41+1/51)
=1/11*(1/51)=1/561
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