如题所述
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999 + 1111 = 2110
123+1289=1412
327+1845=2172
1111 − 199 = 912
70-25=45
123 − 89 = 34
12 Ã 13 = 156
11 Ã 67 = 737
99 Ã 9 = 891
123 Ã 7 = 861