Question

упростить а) (x+y)+(-m-n) b) (a+b)-(b+c)-(a-c) c) (a-b)-(c-d) d) y*(x-y-z)+(zy+y в квадрате).

Answer 1

 а) (x+y)+(-m-n) = x+y-m+n

b) (a+b)-(b+c)-(a-c) = a+b-b-c-a+c = 0

c) (a-b)-(c-d) = a-b-c+d

d) y*(x-y-z)+(zy+y²)= xy-y²-yz+yz+y²=xy