efectuati cu ajutorul calculului prescurtat:
a)x(x-2)+2(x-1)²+(x-1)(x+1)-4(x²+1)
b)(2x+3)²-(3x-1)²+(4-3x)(4+3x)
c)(x+2y)²+3(2x-y)(2x+y)-2(x-y)²
d)2(3y-x)²-(y+2x)²+(x-4y)(x+4y)
e)(2a-4b)²+3a(a-2b)-(a-b)²
f)3(a+2b)(a-2b)-2(a²+b²)+(3a-b)²
VREAU REZOLVARI COMPLETE!!!