2,5,7,9 .1,4 ,10,q .1,6,j,k .1,3,4,6.怎么算24点

1:5 × 7 -(2 + 9)2:(5 × 7) - (2 + 9)3:5 × 7 - 2 - 94:(5 × 7) - 2 - 95:(5 × 7 - 2) - 96:((5 × 7) - 2) - 97:5 × 7 -(9 + 2)8:(5 × 7) - (9 + 2)9:5 × 7 - 9 - 210:(5 × 7) - 9 - ...