Объяснение:
у= -2
(3у-5²)+(2у-5)(2у+5)-12у²=
=3у-25+4у²-25-12у²= -8у²+3у-50=
= -8•(-2)²+3•(-2)-50= -8•4-6-50=
= -32-6-50= -88
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Объяснение:
у= -2
(3у-5²)+(2у-5)(2у+5)-12у²=
=3у-25+4у²-25-12у²= -8у²+3у-50=
= -8•(-2)²+3•(-2)-50= -8•4-6-50=
= -32-6-50= -88