请问这 (1+7-5x^2/12x^2-3)+(1/3-6x)+(3/4x+2) 怎么做？
答案:1 悬赏:50 手机版
解决时间 2021-01-24 19:36
- 提问者网友：容嬷嬷拿针来
- 2021-01-23 21:10
请问这 (1+7-5x^2/12x^2-3)+(1/3-6x)+(3/4x+2) 怎么做？
最佳答案
- 五星知识达人网友：空山清雨
- 2021-01-23 22:44
猜
[1+(7-5x^2)/(12x^2-3)]+1/(3-6x)+3/(4x+2)
=(12x^2-3+7-5x^2)/[3(2x-1)(2x+1)]-(2x+1)/[3(2x-1)(2x+1)]+3(2x-1)/[2(2x+1)(2x-1)]
=(7x^2+4-2x-1+9x-4.5)/[3(2x+1)(2x-1)]
=(7x^2+7x-1.5)/[3(2x+1)(2x-1)].
[1+(7-5x^2)/(12x^2-3)]+1/(3-6x)+3/(4x+2)
=(12x^2-3+7-5x^2)/[3(2x-1)(2x+1)]-(2x+1)/[3(2x-1)(2x+1)]+3(2x-1)/[2(2x+1)(2x-1)]
=(7x^2+4-2x-1+9x-4.5)/[3(2x+1)(2x-1)]
=(7x^2+7x-1.5)/[3(2x+1)(2x-1)].
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