用2,2,6,7算24点,用2,4,10,10算24点,用4,4,10,10点算24点,用5,5,5,1算24点

2 2 6 7 :6+2*(2+7)
2 4 10 10 :(4/10+2)*10
4 4 10 10 :(10*10-4)/4
5,5,5,1:(5-(1/5))×5