题目

口算。 + =           - =           - =             + = - =           - =             1- =               + = 答案：18 + 13 =1124        710 - 310 =25           815 - 13 =15         112 + 34 =56 12 - 14 =14           49 - 13 =19             1- 59 =49              16 + 12 =23

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