如题所述
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18 + 9 = 27
9 + 9 = 18
11 + 29 = 40
45 + 58 = 103
55 + 29 = 84
12 + 79 = 91
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90 − 29 = 61
78 − 49 = 29
45 − 16 = 29
33 − 19 = 14
15 − 9 = 6
50 − 27 = 23
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