(1+2-3)*4*5*6*7*8*9*10*11*12=0
(1-2)-(3-4)+(5-6)-(7-8)+(9-10)-(11-12)=0
(1-2)*(3-4)-(5-6)*(7-8)+(9-10)-(11-12)=0
((1-2)*(3-4)-(5-6)*(7-8))*((9-10)-(11-12))=0
钟面上的1到12这12个数,通过加减运算使计算结果等于0,
(1+2-3)*4*5*6*7*8*9*10*11*12=0
(1-2)-(3-4)+(5-6)-(7-8)+(9-10)-(11-12)=0
(1-2)*(3-4)-(5-6)*(7-8)+(9-10)-(11-12)=0
((1-2)*(3-4)-(5-6)*(7-8))*((9-10)-(11-12))=0