алгебра 7 класс приведите дробь к знаменателю 20балов
1) 11/x-2 к знаменателю:5x-10; x^2-2x
2) 3/a+3 к знам.:2а+6; а^2+3а
3) 2/b-1 к знам.:4b-4; b^3-b^2
4) c/c+4 к знам.:10с+40; с^2-16
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