化簡下列各比
18:9                 
2.5:0.5           36:
2
5
0.6:
1
6
          
5
8
1
4
           
 0.7:0.08.
分析:根據(jù)比的基本性質(zhì)作答,即比的前項(xiàng)和后項(xiàng)同時(shí)乘或除以一個(gè)數(shù)(0除外)比值不變.
解答:解:(1)18:9,
=(18÷9):(9÷9),
=2:1;

(2)2.5:0.5,
=(2.5×2):(0.5×2),
=5:1;

(3)36:
2
5
,
=(36×
5
2
):(
2
5
×
5
2
),
=90:1;

(4)0.6:
1
6

=(0.6×30):(
1
6
×30
),
=18:5;

(5)
5
8
1
4
,
=(
5
8
×8
):(
1
4
×8
),
=5:2;

(6)0.7:0.08,
=(0.7×50)(0.08×50),
=35:4.
點(diǎn)評:此題主要考查了化簡比的方法,另外還要注意化簡比的結(jié)果是一個(gè)比,它的前項(xiàng)和后項(xiàng)都是整數(shù),并且是互質(zhì)數(shù).
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