(2x+5)-(2.5+x)=3怎么做

问题描述:

(2x+5)-(2.5+x)=3怎么做

(2x+5)-(2.5+x)=3
2x+5-2.5-x =3
x+5-5-2.5+2.5 =3-5+2.5
x =0.5