Помогите плиииз решить!!!Докажите что: а(а+b)+b(a+b)=(а+b)^2
Упростите:6(а-2)(а-3)-4(а-3)^2
(3-5х^2)-(3х-2)(5х+1)
4(2-х)^2+5(х-5)^2 

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