13 06
把2 6看作3 0来试商,
商4后和2 6相乘,得1 04,
104比140少36, 36里面有1个26, 该商5。
25 5 2 6 )1 4 0
130 10
25×5=125 26和初商5相乘得130, 所以商5。
5
3 2
60)1
4
4 01 03 403160把2 6看作3 0来试商,
初商为4, 初商4与26相乘后得104, 140-104=36,
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1. 3 9 说出3和9各表示的意义。
2.如果在3和9中间和末尾分别填上一个0,使39变成 309和390。