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先化简比再求比值:(1)42:28=______=______(2)0.5:0.15=______=______(3)78:
先化简比再求比值:(1)42:28=______=______(2)0.5:0.15=______=______(3)78:56=______=______....
先化简比再求比值:(1)42:28=______=______(2)0.5:0.15=______=______(3)78:56=______=______.
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2个回答
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(1)42:28=(42÷14):(28÷14)=3:2,
比值是:42:28=42÷28=1.5;
(2)0.5:0.15=(0.5×100):(0.15×100)=50:15=(50÷5):(15÷5)=10:3,
比值是:0.5:0.15=
:
=
×
=
;
(3)
:
=(
×24):(
×24)=21:20,
比值是:
:
=
÷
=
×
=
.
故填:(1)3:2,1.5;
(2)10:3,
;
(3)21:20,
.
比值是:42:28=42÷28=1.5;
(2)0.5:0.15=(0.5×100):(0.15×100)=50:15=(50÷5):(15÷5)=10:3,
比值是:0.5:0.15=
50 |
100 |
15 |
100 |
50 |
100 |
100 |
15 |
10 |
3 |
(3)
7 |
8 |
5 |
6 |
7 |
8 |
5 |
6 |
比值是:
7 |
8 |
5 |
6 |
7 |
8 |
5 |
6 |
7 |
8 |
6 |
5 |
21 |
20 |
故填:(1)3:2,1.5;
(2)10:3,
10 |
3 |
(3)21:20,
21 |
20 |
展开全部
(1)42:28,
=(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
×24):(
5
6
×24),
=21:20;
7
8
:
5
6
,
=21:20,
=21÷20,
=
21
20
;
(4)
2
3
小时:40分,
=40分:40分,
=1:1;
2
3
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
×24):(
5
6
×24),
=21:20;
7
8
:
5
6
,
=21:20,
=21÷20,
=
21
20
;
(4)
2
3
小时:40分,
=40分:40分,
=1:1;
2
3
小时:40分,
=1:1,
=1÷1,
=1.
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