Сложение и вычитание дробей с одинаковыми и разными знаменателями (8кл)
1. x/y - x/x+9
2.a/a-b - a²/a²-b²
3. 2 + x/y + y/x
4. 3x+1/3x - 2y+1/2y + 3x-y/6xy
5. 3/x+2y + 3x/x²+4xy+4y²
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