3,12和15的最小公倍数是60,所以公分母是60
3分之2=(3×20)分之(2×20)=60分之40
12分之1=(12×5)分之(1×5)=60分之5
15分之4=(15×4)分之(4×4)=60分之16
猜你喜欢
- 1当a=3,b=2时分别求代数式a的平方—2ab+b的平方和(a+b)(a-2b)的值 要迅速
- 2ssschildren will think their parents should do chores and won’t like cleaning the room after they
- 3look good,look well 哪个正确?
- 4I have never been there.He hasn’t been there,either.(改为同义句)
- 5用高的不同词义组词
- 6A book_____by Tom last week用read的被动语态填空
- 7下列溶液加热蒸干后,能析出相应的溶质固体的是( ) A.FeCl3 B.KHCO3 C.Al2(SO4)3 D.NH4HCO3
- 8everything at once 中英文对照歌词?
- 9在标准状况下如果2L氧气中含有m个分子,则阿弗加德罗常数为多少
- 10把一块木头放入水中,木头浮在水上,说明木头的密度比水的小,为什么?