90 балов, прошу помочь!
Упростите выражения
А) (a+1) ^2-2(a+1) +1
Б) (m-n) ^2+2n(m-n) +n^2
В) (p-q) ^2-2(p^2-q^2) +(p+q) ^2
Г) (x+2y) ^2+2(x^2-4y^2) +(2y-x) ^2
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