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一、直接写出得数
17 – 8 = 9  11 – 3 = 8  24 + 5 = 29  60 + 22 – 2 = 80
41 + 20 = 61 7 + 62 = 69 68 – 5 = 63 78 – 50 + 30 = 58
89 – 7 = 82 6 + 8 = 14 16-9 = 7 65 –60 + 80 = 85
90 – 10 = 80 50 + 38 = 88 54 – 40 = 14 78 – 5 – 30 = 43
29 + 40 = 69 15 – 8 = 7 30 + 60 = 90 32 + 50 –40 = 42

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