试卷更新日期：2018-10-29 类型：同步测试
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+ 5 = 13 6 += 14 +8 = 16
8 +=17 + 8 =15 4 +=12
10 – 8 + 9 = 16 + 3 – 5 = 19 – 4 – 3 =
18 – 6 – 2 = 19 – 9 – 7 = 2 + 7 + 8 =
(2)、
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