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12÷4=3表示把12平均分成4份,每份是3, 原題漏記“平均分”,說法錯誤. 故答案為:×.
(68分之1+51分之2)乘以17+17除以51 =17/68+2*17/51+17/51 =1/4+(2+1)*17/51 =1/4+3*1/3 =1又1/4
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