РЕШИТЕ ПОЖАЛУЙСТА!!!
Решите уровнения:
a)x^2+13x+42=0
b)3x^2-11x+6=0
Cократите дробь:
a)x^2-10+21/2x^2-15x+7
Упростите:
(y/y^2+2y-3 - у-1/y^2-9) : y+1/y^2-4y+31
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