3()3()3()4()3=0 括号里只能填“+” “-” “x”

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3()3()3()4()3=0括号里只能填“+”“-”“x”3()3()3()4()3=0括号里只能填“+”“-”“x”3()3()3()4()3=0括号里只能填“+”“-”“x”3x3-3x4+3=

3()3()3()4()3=0 括号里只能填“+” “-” “x”
3()3()3()4()3=0 括号里只能填“+” “-” “x”

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