(X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9) 问X得多少
答案:2 悬赏:20 手机版
解决时间 2021-03-01 07:31
- 提问者网友:niaiwoma
- 2021-02-28 14:42
(X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9) 问X得多少
最佳答案
- 五星知识达人网友:神的生死簿
- 2021-02-28 16:01
(X-4)/(X-5)-(X-5)/(X-6)=(X-7)/(X-8)-(X-8)/(X-9)
[(x-4)(x-6)-(x-5)²]/(x-5)(x-6)=[(x-7)(x-9)-(x-8)²]/(x-8)(x-9)
(x²-10x+24-x²+10x-25)/(x²-11x+30)=(x²-16x+63-x²+16x-64)/(x²-17x+72)
整理得:
-1/(x²-11x+30)=-1/(x²-17x+72)
即:
x²-11x+30=x²-17x+72
17x-11x=72-30
6x=42
x=7
[(x-4)(x-6)-(x-5)²]/(x-5)(x-6)=[(x-7)(x-9)-(x-8)²]/(x-8)(x-9)
(x²-10x+24-x²+10x-25)/(x²-11x+30)=(x²-16x+63-x²+16x-64)/(x²-17x+72)
整理得:
-1/(x²-11x+30)=-1/(x²-17x+72)
即:
x²-11x+30=x²-17x+72
17x-11x=72-30
6x=42
x=7
全部回答
- 1楼网友:未来江山和你
- 2021-02-28 17:09
7
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