1/3*X-[(X+4.5)-7.2]=0.9 X等于多少,

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 移项
1/3*X-(X+4.5)=0.9-7.2
1/3*X-X-4.5=-6.3
-2/3*X=4.5-6.3
-2/3*X=-1.8两边同除-2/3,
得:X=2.7

同时×3 X-3(X+4.5)+21.6=2.7
-2X-13.5+21.6=2.7
X=2.7

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