3()3()3()4()3=0 括号里只能填“+” “-” “x”

问题描述:

3()3()3()4()3=0 括号里只能填“+” “-” “x”

3x3-3x4+3=0

3x3+3-4x3=0

3+3x3-4x3
不用谢我,我的名字叫雷锋