90 17 8
2. 和:99 81 99 54 85 96 95 71 87 65
差:65 31 47 16 29 38 27 13 17 31
3. 71 23 43
41 68 19
90 54 85
27 52 36
62 55 58
28 43 55
4. 85-19 26+42 93-28 96-32
5. 17 45 56 53
6. 45+45-10=80(个)
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