3456:
21 = 3*(6+5-4)
22 = 4*6 +3-5
23 = 3*4 +5+6
24 = 6*(3+5-4)
25 = 3*5 +4+6
26 = 4*6 +5-3
27 = 3*6 +4+5
hao shu!
21 = 3*(6+5-4)
22 = 4*6 +3-5
23 = 3*4 +5+6
24 = 6*(3+5-4)
25 = 3*5 +4+6
26 = 4*6 +5-3
27 = 3*6 +4+5
hao shu!
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