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320➗30竖式计算

:52➗5十53➗5十54➗5十55➗5十56➗5 =(52+53+54+55+56)÷5 =54*5÷5 =54

15x23x4=15x4x23=60x23=1380540➗36=540➗(9×4)=540➗9➗4=60➗4=15

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