1+1/(x+5)+1/(x+5+7)+1/(x+5+7+9)=
答案:1 悬赏:30 手机版
解决时间 2021-03-13 06:31
- 提问者网友:聂風
- 2021-03-12 06:39
1+1/(x+5)+1/(x+5+7)+1/(x+5+7+9)=
最佳答案
- 五星知识达人网友:零点过十分
- 2021-03-12 07:50
(x+1)(x+3)(x+5)(x+7)-9
=[(x+1)(x+7)][(x+3)(x+5)]-9
=[x^2+8x+7][(x^2+8x+15]-9
=[x^2+8x]^2+22[x^2+8x]+96
=[x^2+8x+6][x^2+8x+16]
=(x^2+8x+6)(x+4)^2
=[(x+1)(x+7)][(x+3)(x+5)]-9
=[x^2+8x+7][(x^2+8x+15]-9
=[x^2+8x]^2+22[x^2+8x]+96
=[x^2+8x+6][x^2+8x+16]
=(x^2+8x+6)(x+4)^2
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