1. При каких значениях переменной определена дробь:

а) 7/x+1
б) (7y+1)(2y-5)/(2y+7)(y-3)
в) 5x^7-3x^2+1/x^2+5x+6
г) 2t-1/t^2+4 д) x+1/x-2
е) y^3+1/y^2-9
ё) w^2-3w+7/2w^2+9w-5

2. Сократите дробь:
а) 7x^2y/7x
б) y^2-9/y-3
в) u+2/u^2-4
г) x^2-16/x+4
д) t^2-t-6
e) u^2+3u-4/2u+u-3
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