5: 136 0 35
6: 3 2
7: x=30+20 x=50 x=5.7--3.6 x=2.1
8: 1.6 72 7.7
9: ① 错 x=120--25 x=95 ② 错 x=2.6+0.4 x=3
10: 100 2.1 1.82 15 130 3.2
11: x+3.5= 6 x=2.5
12: 略
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