Question

Упростите выражение 7 класс

Answer 1

b-a+b+a=2b
x-y-z+y=x-z
c-10+15-c=5
x+y+x+x-y=3x

Answer 2

a)b-a+b+a= b+b + a-a = 2b
b)x-y-z+y=  x-z -y+y= x-z
c) c-10+15-c= c-c -10+15= 5
d) x+y+x+x-y= x+x+x +y-y= 3x
===========================