两数相除，商是5，余数是15，如果被除数和除数同时乘20，商是多少？余数是多少？
口算．+=﹣=+=﹣=+=+=﹣= 2﹣= 1﹣﹣=
直接写出得数．﹣=+=+=+= 1﹣=﹣= 3+=﹣= 3﹣1=+=+=+3=
．
直接写出得数．﹣= 0.7﹣0.62= 12÷25== 10=+×0= 13×= 10=
直接写得数．+=+= 1﹣=﹣=﹣=+=﹣1=﹣= 3﹣1=+=
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