Odpowiedzi

2009-12-02T16:30:34+01:00
A) -3×(-4x-2)= -3(-4-2)= 12+6=18
b) 4+3x²+2x+4y-2x²+y²-y+7= 4+3*1²+2-4-2*1²-1²+1+7= =4+3*1+4-4-2*1+1+7= 4+3+4-4-2+1+7= 13
c)(3x+11)²= (3+11)²=9+121=130
d)(4x-6)² =(4-6)²=16-36=-20
e)-2(z-4)+5(z-4 )=-2z+8+5z-20=-3z-12
f)(a-1)²-(2a-1)²+2 (a-2)(-2-3x)=a²+1-4a²-1+2a-4-2-3=-3a²+2a-9