100 以内加减混合(带括号)九

 2021年06月03日 08:40  210  发表评论  打印本文  
51 - (21 + 13) = 48 + (69 - 42) = 46 + (86 - 56) =
77 - (21 + 30) = 21 + (37 - 29) = 31 + (80 - 31) =
38 - (25 + 11) = 24 + (75 - 41) = 52 + (32 - 16) =
65 - (11 + 29) = 31 + (44 - 21) = 61 + (66 - 31) =
93 - (66 + 15) = 11 + (91 - 28) = 37 + (68 - 53) =
81 - (27 +
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