👤

A.
-(-x-y-2)-(4y+5x-9)
B.
-(-3a-2c-1)+(6a-11c+11)
C.
-(x^2+x+1)-(-x^2+x-1)​


Odpowiedź :

A.

-(-x-y-2)-(4y+5x-9)=x+y+2-4y-5x+9=x-5x+y-4y+2+9=-4x-3y+11

B.

-(-3a-2c-1)+(6a-11c+11)=3a+2c+1+6a-11c+11=3a+6a+2c-11c+1+11=9a-9c+12

C.

-(x²+x+1)-(-x²+x-1)​=-x²-x-1+x²-x+1=-x²+x²-x-x-1+1=-2x

Odpowiedź:

[tex]a)\ \ -(-x-y-2)-(4y+5x-9)=x+y+2-4y-5x+9=-4x-3y+11\\\\b)\ \ -(-3a-2c-1)+(6a-11c+11)=3a+2c+1+6a-11c+11=9a-9c+12\\\\c)\ \ -(x^2+x+1)-(-x^2+x-1)=-x^2-x-1+x^2-x+1=-2x[/tex]