2. Сократите дробь: а) 42d^2-24d/(4-7d)^2;
б) 6x-28y/9x^2-42xy;
в) m^3-64n^3/16n^2+4mn+m^2;
г) 2b-a/3(a-2b)+x(a-2b).
3. Представьте в виде дроби выражение:
а) x-7/x+2 - x+7/x-2;
б) 1/5-c + 5/c^2-5c;
в) 3d^2-1/d-1 - d-1;
г) 1/16-2a + a^2/a^3-64a.
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