20б. Решите 1 дробное выражение. Подробно. (Написала дробью сразу)
б) \frac{4a^2+ b^2}{(2a-b)^2} + \frac{6ab^2-b^2}{(b-2a)^2} + \frac{6ab^2+b^2}{4ab-4a^2-b^2}
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