题目内容
| 化简比. 48:36= |
|
|
| ||||||||||
| 7:0.25= | 0.3:1= | 8:2.4= | 7.5:
|
分析:根据比的基本性质作答,即比的前项和后项同时乘一个数或除以一个数(0除外)比值不变.
解答:解:(1)48:36
=(48÷12):(36÷12)
=4:3;
(2)
:
=(
×
):(
×
)
=6:5;
(3)
:3
=(
×
):(3×
)
=2:7;
(4)
:
=(
×72):(
×72)
=64:63;
(5)7:0.25
=(7×4):(0.25×4)
=28:1;
(6)0.3:1
=(0.3×10):(1×10)
=3:10;
(7)8:2.4
=(8×
):(2.4×
)
=10:3;
(8)7.5:
=(7.5×6):(
×6)
=45:2.
=(48÷12):(36÷12)
=4:3;
(2)
| 4 |
| 5 |
| 2 |
| 3 |
=(
| 4 |
| 5 |
| 15 |
| 2 |
| 2 |
| 3 |
| 15 |
| 2 |
=6:5;
(3)
| 6 |
| 7 |
=(
| 6 |
| 7 |
| 7 |
| 3 |
| 7 |
| 3 |
=2:7;
(4)
| 8 |
| 9 |
| 7 |
| 8 |
=(
| 8 |
| 9 |
| 7 |
| 8 |
=64:63;
(5)7:0.25
=(7×4):(0.25×4)
=28:1;
(6)0.3:1
=(0.3×10):(1×10)
=3:10;
(7)8:2.4
=(8×
| 5 |
| 4 |
| 5 |
| 4 |
=10:3;
(8)7.5:
| 1 |
| 3 |
=(7.5×6):(
| 1 |
| 3 |
=45:2.
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.
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