Ответы на вопрос:
1) =x^6(1 -x²) /x²(x² -1) = -x^4(x² -1) /(x² -1) = -x^4 2) =b^7(1 -b^3) /b^3(b^6 -1) = -b^4(b^3 -1) /(b^3 -1)(b^3 +1) = -b^4 /(b^3 +1)
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