a²-b²/a²-2ab+b² 怎么约分还有2.x+xy/y²-13.a²-b²/a²-2ab+b²4.4x-x²/16-x²5.x²-y²/3x²+6xy+3y²
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a²-b²/a²-2ab+b² 怎么约分还有2.x+xy/y²-13.a²-b²/a²-2ab+b²4.4x-x²/16-x²5.x²-y²/3x²+6xy+3y²
a²-b²/a²-2ab+b² 怎么约分
还有
2.x+xy/y²-1
3.a²-b²/a²-2ab+b²
4.4x-x²/16-x²
5.x²-y²/3x²+6xy+3y²
a²-b²/a²-2ab+b² 怎么约分还有2.x+xy/y²-13.a²-b²/a²-2ab+b²4.4x-x²/16-x²5.x²-y²/3x²+6xy+3y²
分子(a+b)(a-b)
分母(a-b)^2
分子分母约掉一个 a-b
原式=(a+b)/(a-b)
a²-b²/a²-2ab+b²
=(a+b)(a-b)/(a-b)²
=(a+b)/(a-b)
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﹙a+b﹚﹙a-b﹚/﹙a-b﹚²=a+b/a-b