数学计算(7+x²)/(x+3)-3+x
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解决时间 2021-11-12 17:40
- 提问者网友:临风不自傲
- 2021-11-11 18:55
数学计算(7+x²)/(x+3)-3+x
最佳答案
- 五星知识达人网友:渊鱼
- 2021-11-11 20:11
(7+x²)/(x+3)-3+x
=(7+x²+x²-9)/(x+3)
=(2x²-2)/(x+3)
=2(x²-1)/(x+3)
=(7+x²+x²-9)/(x+3)
=(2x²-2)/(x+3)
=2(x²-1)/(x+3)
全部回答
- 1楼网友:走死在岁月里
- 2021-11-11 22:22
(7+x²)/(x+3)-3+x=[(7+x^2)-(9-x^2)]/(x+3) =(2x^2-2)/(x+3)
- 2楼网友:渊鱼
- 2021-11-11 21:52
通分:
(7+x²)/(x+3)-(3-x)(3+x)/(3+x)=(7+x²)-(9-x²)/(x+3)=2(x²-1)/(x+3)
(7+x²)/(x+3)-(3-x)(3+x)/(3+x)=(7+x²)-(9-x²)/(x+3)=2(x²-1)/(x+3)
- 3楼网友:往事隔山水
- 2021-11-11 20:18
(7+x²)/(x+3)-3+x
=(7+x²)/(x+3)+(x-3)(x+3)/(x+3)
=[7+x²+x²-9]/(x+3)
=(2x²-2)/(x+3)
=(7+x²)/(x+3)+(x-3)(x+3)/(x+3)
=[7+x²+x²-9]/(x+3)
=(2x²-2)/(x+3)
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