如何用3377算24点

1: (3 + 3 7) 7=242: (3 + (3 7)) 7=243: (3 7 + 3) 7=244: ((3 7) + 3) 7=245: 7 (3 + 3 7)=246: 7 (3 + (3 7))=247: 7 (3 7 + 3)=248: 7 ((3 7) + 3)=24