△十○十口=45 (1)○一△=8 (2)△一□=17 (3)(1)+(2),2○十口=53 (4)(2)+(3),○-口=25 (5)(4)+(5),3○=78,∴ ○=26,代入(5),口=26-25=1代入(3),△=17+1=18∴ ○=26,口=1,△=18
○=26 △=18 □=1