(5,6- 3 1/3):(1,5+1 1/3)
(5.6-3×1\3):(1.5+1×1\3) (5.6-1):(15\10+1\3) 4.6:(3\2+1\3) 46\10:{9+2}\6 23\5:11\6 23\5×6\11 138\55