Упростите выражение:
а)(2а-1)²-(2а+1)²
б)(x²+1)²-x²(x²+2)
в)(2n-1)²+(2n)²+(2n+1)²
г)(a+b-4)²+8(a+b-2)
а)(2а-1)²-(2а+1)²
б)(x²+1)²-x²(x²+2)
в)(2n-1)²+(2n)²+(2n+1)²
г)(a+b-4)²+8(a+b-2)
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