【五年级上册数学作业本答案第29页】-查字典问答网
谭卫毅
设一次要运X次
7.5X=60
X=60÷7.5
X=8
4X=6.8
X=6.8÷4
X=1.7
315÷X=30
X=315÷7.5
X=90
4设.
7.5X=30
X=30÷7.5
X=4
5设.
X-6.5=62.5
X=62.5+6.5
X=69
6设.
12X=57
X=57÷12
X=4.75
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