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(1)2.5:6,
=(2.5×10):(6×10),
=25:60,
=(25÷5):(60÷5),
=5:12;
2.5:6,
=2.5÷6,
=
;
(2)
:
,
=(
×8):(
×8),
=6:7;
:
,
=
÷
,
=
,
(3)5:
,
(5×5):(
×5),
=25:1,
5:
,
=5÷
,
=25;
(4)45分:1
小时,
=
小时:
小时,
=
:
,
=(
×12):(
×12),
=9:16;
45分:1
小时,
=
小时:
小时,
=
:
,
=
:
,
=
.
=(2.5×10):(6×10),
=25:60,
=(25÷5):(60÷5),
=5:12;
2.5:6,
=2.5÷6,
=
5 |
12 |
(2)
3 |
4 |
7 |
8 |
=(
3 |
4 |
7 |
8 |
=6:7;
3 |
4 |
7 |
8 |
=
3 |
4 |
7 |
8 |
=
6 |
7 |
(3)5:
1 |
5 |
(5×5):(
1 |
5 |
=25:1,
5:
1 |
5 |
=5÷
1 |
5 |
=25;
(4)45分:1
1 |
3 |
=
3 |
4 |
4 |
3 |
=
3 |
4 |
4 |
3 |
=(
3 |
4 |
4 |
3 |
=9:16;
45分:1
1 |
3 |
=
3 |
4 |
4 |
3 |
=
3 |
4 |
4 |
3 |
=
3 |
4 |
4 |
3 |
=
9 |
16 |
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