Ответ:
1)7(2у²-5у-3)-4(3у²-9у-5)=14у²-35у-21-12у²+36у+20=2у²+у-1
2)х²(4у²)+у²(х²-7)-4х(х-3)=4х²у²+х²у²-7у²-4х²+12х=5х²у²-7у²-4х²+12х
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Ответ:
1)7(2у²-5у-3)-4(3у²-9у-5)=14у²-35у-21-12у²+36у+20=2у²+у-1
2)х²(4у²)+у²(х²-7)-4х(х-3)=4х²у²+х²у²-7у²-4х²+12х=5х²у²-7у²-4х²+12х