X+1/2-5X-( )/3=-1/2 X=2求括号内的数

问题描述:

X+1/2-5X-( )/3=-1/2 X=2求括号内的数

X+1/2-5X-( )/3=-1/2
将X=2代入,得
2+1/2-10-( )/3=-1/2
-15/2-( )/3=-1/2
-( )/3=-7
( )=21