Question

exercițiul 7 va roooggg

Answer 1

a. -13x-15y+9x-(19x+3y-12x)+7y=-4x-15y-19x-3y+12x+7y=-23x-18y+12x+7y=
=-11x-11y=-11(x+y)
b.(5x-8y)-(11x+3y)-(-13x-5y)=5x-8y-11x-3y+13x+5y=-6x-11y+13x+5y=
=19x-6y
c.(4x2-3y+2x)-(4x+6y-5x2)-(9x2-7y-3x)=4x2-3y+2x-4x-6y+5x2-9x2+7y+3x=
=9x2-3y-2x-6y-9x2+7y+3x=-9y-2x+7y+3x=-2y-2x+3x=-2y+x
d.(3a+4b-2c)+(-5a-6b+4c)-(4a-7b-5c)=3a+4b-2c-5a-6a+4c-4a+7b+5c=
=-2a+4b-2c-6a+9c-4a+7b=-8a+11b+7c-4a=-12a+11b+7c
e.(5x-3a+2b)-(4x-5a+6b)-(7a-6x-5b)=5x-3a+2b-4x+5a-6b-7a+6x+5b=
=x+2a-4b-7a+6x+5b=7x-5a+b