答案不止一种.
列出3位加3位=4位的,那么4位减3位=3位的一样.
437+589 = 1026 【1026 - 437 = 589,1026 - 589 = 437】
246+789 = 1035
264+789 = 1053
473+589 = 1062
324+765 = 1089
432+657 = 1089
346+752 = 1098
423+675 = 1098
347+859 = 1206
426+879 = 1305
624+879 = 1503
743+859 = 1602