Ответы на вопрос:
12x/(x-y)+7x²/(x-y)(x+y)=(2x²+2xy+7x²)/9x²-y²)=(9x²+2xy)/9x²-y²) 2 3a(1-2b)/a^4b³ *2a²b/(1-2b)(1+2b)=6/ab²(1+2b)
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