题干

口算.

1
4
÷2 =____
1
4
×2
=____
3
5
÷3
=____
5
7
÷4
=____
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答案(点此获取答案解析)

18,12<\

同类题3

— Did he realize the serious situation immediately?
— No. It was quite a long time ________ he really realized it.