УпраститеУпрастите выражение(3a+5b)(2a-3)-(10ab+6a²)
1)-9a-15b
2)-9a+15 b
3)9a+15b
4)9a-15b
Решите уравнение 9у²-(3у-1)(3у-2)=16
Помогите!
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