Odpowiedź :
a. 5x - 3y + 4x -7y=5x+4x-3y-7y=9x-10y
b. -2( x - y + 3z - 1)=-2x-2·(-y)-2·3z-2·(-1)=-2x+2y-6z+2
c. (2x + 2y) + (x -y) - (x - 2y)=2x+2y+x-y-x+2y=2x+3y
d. (3x -2) (4x+5)=12x²+15x-8x-10=12x²+7x-10
a. 5x - 3y + 4x -7y
9x-10y
b. -2( x - y + 3z - 1)
-2x+2y-6z+2
c. (2x + 2y) + (x -y) - (x - 2y)
2x+2y+x-y-x+2y
2x+3y
d. (3x -2) (4x+5)
3x*4x+3x*5-2*4x-2x*5
12x2+15x-8x-10
12x2+7x-10