Answered

SVP aidez moi:

 

7(x-5)-(x-5)(9-2x)=

 

(2x-3)²+(2x-3)(x+1)=

 

(5-x)(x+1)-(5-x)²=

Sagot :

 7x-35-(9x-2x²-45+10x)

=7x-35-9x+2x²+45-10x

=2x²-12x+10

 

4x²-12x+9+2x²+2x-3x-3

=6x²-13x+6

 

5x+5-x²-x-(x²-10x+25)

=5x+5-x²-x-x²+10x-25

=-2x²+14x-20