1.Спрости ти вираз:
(7а-2в)²+(3а-в)(4а-5в)
2.Розкласти на множники:
1)в²-49
2)с²-8м+16
3)7а²+14а
4)а+в+а²-в²
3. розв'язати рівняння
1)11х-9=4х+19
2)7х-5(2х+2)=5х+15​
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