先化简比再求比值:(1)42:28(2)0.5:0.15(3)78:56(4)23小时:40分.
先化简比再求比值:(1)42:28(2)0.5:0.15(3)78:56(4)23小时:40分....
先化简比再求比值:(1)42:28(2)0.5:0.15(3)78:56(4)23小时:40分.
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(1)42:28,
=(42÷14):(28÷14),
=3:2;
42:28,
=3:2,
=3÷2,
=
;
(2)0.5:0.15,
=(0.5×20):(0.15×20),
=10:3;
0.5:0.15,
=10:3,
=10÷3,
=
;
(3)
:
,
=(
×24):(
×24),
=21:20;
:
,
=21:20,
=21÷20,
=
;
(4)
小时:40分,
=40分:40分,
=1:1;
小时:40分,
=1:1,
=1÷1,
=1.
=(42÷14):(28÷14),
=3:2;
42:28,
=3:2,
=3÷2,
=
3 |
2 |
(2)0.5:0.15,
=(0.5×20):(0.15×20),
=10:3;
0.5:0.15,
=10:3,
=10÷3,
=
10 |
3 |
(3)
7 |
8 |
5 |
6 |
=(
7 |
8 |
5 |
6 |
=21:20;
7 |
8 |
5 |
6 |
=21:20,
=21÷20,
=
21 |
20 |
(4)
2 |
3 |
=40分:40分,
=1:1;
2 |
3 |
=1:1,
=1÷1,
=1.
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