题目内容
求比值
1
:0.75
0.9分米:3米
:0.375
3
:
.
1
| 1 |
| 2 |
0.9分米:3米
| 7 |
| 8 |
3
| 2 |
| 3 |
| 2 |
| 11 |
分析:首先把不同单位的名数化成相同单位,然后根据比的基本性质,即比的前项和后项同时乘或除以一个相同的数(0除外)比值不变,进而把比化成最简比,最后用前项除以后项,即可得到比值.
解答:解:1
:0.75
=
:
=(
×
):(
×
)
=2:1
=2÷1
=2
0.9分米:3米
=0.9分米:30分米
=
:30
=(
×
):(30×
)
=3:100
=3÷100
=0.03
:0.375
=
:
=
:
=7:3
=7÷3
=
3
:
=
:
=(
×33):(
×33)
=121:6
=121÷6
=
| 1 |
| 2 |
=
| 3 |
| 2 |
| 3 |
| 4 |
=(
| 3 |
| 2 |
| 4 |
| 3 |
| 3 |
| 4 |
| 4 |
| 3 |
=2:1
=2÷1
=2
0.9分米:3米
=0.9分米:30分米
=
| 9 |
| 10 |
=(
| 9 |
| 10 |
| 10 |
| 3 |
| 10 |
| 3 |
=3:100
=3÷100
=0.03
| 7 |
| 8 |
=
| 7 |
| 8 |
| 375 |
| 1000 |
=
| 7 |
| 8 |
| 3 |
| 8 |
=7:3
=7÷3
=
| 7 |
| 3 |
3
| 2 |
| 3 |
| 2 |
| 11 |
=
| 11 |
| 3 |
| 2 |
| 11 |
=(
| 11 |
| 3 |
| 2 |
| 11 |
=121:6
=121÷6
=
| 121 |
| 6 |
点评:此题考查求比值的方法,注意化简比的结果仍是一个比,它的前项和后项都是整数,并且是互质数;而求比值的结果才是一个数.
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