Помогите пожалуйста с алгеброй 7 класс!!!
Преобразуйте произведение в многочлен
1)2ав(2а^2-5ав+в^2)
2)-3ав(2а^2-7ав-в^2)
3)-1/2ху(5х^2+10ху-4у^2)
4)(-1 1/2m^2-3/4mn+n^2)(-2mn)
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