a) x + 8 - (x+22) = x + 8 - x - 22 = ( x - x ) + ( 8 - 22 ) = 0 + -14 = -14
b) -(x + 5) + (x+10) - 5 = -x + -5 + x + 10 - 5 = (-x+x) + (-5 + 10 -5) = 0 + (5 - 5) = 0 + 0 = 0
Nhấn đúng cho mình nha!!!!!!!!!!!!!!
a, x+8-(x+22)
=x+8-x-22=(x-x)+(8-22)=-14
b, -(x+5)+(x+10)-5
=-x+(-5)+x+10-5
=(-x+x)=(-5+10-5)
=0