Question

urgent! multumesc!!!!!!!!!

Answer 1

I.

1)  3(-x+2y)-2(x+3y)=

-3x+6y-2x-6y=-5x

2)  3x(x+1)+(x-1)(x-2)=

3x²+3x+x²-2x-x+2=

4x²+2=2(2x²+1)

3) (-√2x)²=√4x²=2x

4) x+5[3(x-2)-2(x-3)]=

x+5(3x-6-2x+6)=

x+5x=6x

5) [(x+2)(2x-5)-x(2x-1)]*(-3x²)=

(2x²-5x+4x-10-2x²+x)*(-3x²)=

-10*(-3x²)=30x²

6)  3(x²-2xy-y²)+2(x²+3xy+2y²)=

3x²-6xy-3y²+2x²+6xy+4y²=

5x²+y²