Question

Efectuati inmultirile,apoi reduceti termenii asemenea.
a) 2(x+y)-3x=?

b) 2(a+b)-3a-6*(b-a)=?

c) -3(x+y-3)+2(x-y)-6=?

d) -5(x+xy^2-y)+6-x+y)*(-xy)-x^2y=?

e) [3(x-y)-6(-x-y)+2]*(-3)-(3-5y)*(-1)=?

Answer 1

a)2(x+y)-3x=2x+2y-3x=-x+2y
b)2(a+b)-3a-6(b-a)=2a+2b-3a-6b+6a=5a-4b
c)-3(x+y-3)+2(x-y)-6=-3x-3y+9+2x-2y=-x-5y+9
e)[3(x-y)-6(-x-y)+2]·(-3)-(3-5y)·(-1)=(3x-3y+6x+6y+2)·(-9+15y)=(9x+3y+2)·(-9+15y)=-81x-27y-18+135xy+45y²+30y=81x+3y-18+135xy+45y²
la d nu ai scris bine parantezele
d)-5(x+xy²-y)+(6-x+y)·(-xy)-x²y=-5x-5xy²+5y-6xy+x²y-xy²-x²y=-5x-6xy²+5y-6xy