题目内容
把连比化为最简整数比:
(1)2:4:8=
(2)18:27:45=
(3)
:
:
=
(4)1
:1
:1=
(5)0.3:0.15:0.45=
(6)1.6:2.4:4=
(1)2:4:8=
1:2:4
1:2:4
;(2)18:27:45=
2:3:5
2:3:5
;(3)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
3:2:1
3:2:1
;(4)1
| 1 |
| 8 |
| 1 |
| 4 |
9:5:8
9:5:8
;(5)0.3:0.15:0.45=
2:1:3
2:1:3
;(6)1.6:2.4:4=
2:3:5
2:3:5
.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)2:4:8,
=(2÷2):(4÷2):(8÷2),
=1:2:4;
(2)18:27:45,
=(18÷6):(27÷9):(45÷9),
=2:3:5;
(3)
:
:
,
=(
×6):(
×6):(
×6),
=3:2:1;
(4)1
:1
:1,
=(
×8):(
×8):(1×8);
=9:5:8;
(5)0.3:0.15:0.45,
=(0.3×
):(0.15×
):(0.45×
),
=2:1:3;
(6)1.6:2.4:4,
=(1.6×
):(2.4×
):(4×
),
=2:3:5.
故答案为:1:2:4,2:3:5,3:2:1,9:5:8,2:1:3,2:3:5.
=(2÷2):(4÷2):(8÷2),
=1:2:4;
(2)18:27:45,
=(18÷6):(27÷9):(45÷9),
=2:3:5;
(3)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=3:2:1;
(4)1
| 1 |
| 8 |
| 1 |
| 4 |
=(
| 9 |
| 8 |
| 5 |
| 4 |
=9:5:8;
(5)0.3:0.15:0.45,
=(0.3×
| 20 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
=2:1:3;
(6)1.6:2.4:4,
=(1.6×
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
=2:3:5.
故答案为:1:2:4,2:3:5,3:2:1,9:5:8,2:1:3,2:3:5.
点评:此题主要考查了化简比的方法,另外还要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.
练习册系列答案
相关题目