题目内容
化简比. 15:120 |
5.6:0.35 |
0.6:3 |
35:20:15. |
分析:根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变.
解答:解:(1)15:120,
=(15÷15):(120÷15),
=1:8;
(2)5.6:0.35,
=(5.6×100):(0.35×100),
=560:35,
=(560÷35):(35÷35),
=16:1,
(3)0.6:3,
=(0.6×10):(3×10),
=6:30,
=(6÷6):(30÷6),
=1:5;
(4)35:20:15,
=(35÷5):(20÷5):(15÷5),
=7:4:3.
=(15÷15):(120÷15),
=1:8;
(2)5.6:0.35,
=(5.6×100):(0.35×100),
=560:35,
=(560÷35):(35÷35),
=16:1,
(3)0.6:3,
=(0.6×10):(3×10),
=6:30,
=(6÷6):(30÷6),
=1:5;
(4)35:20:15,
=(35÷5):(20÷5):(15÷5),
=7:4:3.
点评:本题主要考查了化简比的方法,注意化简比的结果是一个比,它的前项和后项都是整数,并且是互质数.
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