题目内容
把线段比例尺改成数值比例尺.
(1):
(2):
(3):
(1):
1:1500000
1:1500000
(2):
1:200000
1:200000
(3):
1:900
1:900
.分析:比例尺=图上距离:实际距离,据此线段比例尺转化成数值比例尺,然后分析判断.
解答:解:(1)1厘米:15千米,
=1厘米:1500000厘米,
=1:1500000;
(2)1厘米:2千米,
=1厘米:200000厘米,
=1:200000;
(3)1厘米:9米,
=1厘米:900厘米,
=1;900.
故答案为:1:1500000,1:200000,1:900.
=1厘米:1500000厘米,
=1:1500000;
(2)1厘米:2千米,
=1厘米:200000厘米,
=1:200000;
(3)1厘米:9米,
=1厘米:900厘米,
=1;900.
故答案为:1:1500000,1:200000,1:900.
点评:本题主要考查线段比例尺和数值比例尺的转化,注意千米化成厘米乘进率100000.
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