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(□○□)○□=□(辆)
(□○□)○□=□(个)
□÷□-□=□
(□+□)÷□=□
24-12÷3(24-12)÷3 5×9-45×(9-4)
25+15÷5(25+15)÷5 14-5×2(14-5)×2
(□○□)○□=□(盘)
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