Если выполнено верно поставь знак +, если неверно – 1) 4х^2 -1= (2х -1)^2
2) (х - 2у)^2 = х^2 +4у^2
3)(х + 2у)^3= х^3 + 6х^2у+6ху^2 + 8у^3
4) (c - d)^2=(d-c)^2
5)(2х+y)^2= 4х^2+4ху+у^2
6) 27а^3+1= (3а+1)(9а^2+3а+1)
7) c^3-8d^3=(c-2d)(c^2+2cd+4d^2)
8) 9m^2-6mn-n^2= (3m –n)^2
9) (а-в)(а-в)=а^2-в^2
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