1/3*X-[(X+4.5)-7.2]=0.9

问题描述:

1/3*X-[(X+4.5)-7.2]=0.9
X等于多少,

1/3*X-[X+4.5-7.2]=0.9
1/3*X-X-4.5+7.2=0.9
-2/3*X=-1.8
x=2.7