先求比值再化简比 13:29 3:02 433:211 1:0.125.
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(1)
:
,
=(
×9):(
×9),
=3:2;
:
,
=
÷
,
=1.5;
(2)3:0.2,
=(3×10):(0.2×10),
=30:2,
=(30÷2):(2÷2),
=15:1;
3:0.2,
=3÷0.2,
=15;
(3)
:
,
=(
×
):(
×
),
=2:3;
:
,
=
÷
,
=
;
(4)1:0.125,
=1:
;
=(1×8):(
×8),
=8:1;
1:0.125,
=1÷0.125,
=8.
1 |
3 |
2 |
9 |
=(
1 |
3 |
2 |
9 |
=3:2;
1 |
3 |
2 |
9 |
=
1 |
3 |
2 |
9 |
=1.5;
(2)3:0.2,
=(3×10):(0.2×10),
=30:2,
=(30÷2):(2÷2),
=15:1;
3:0.2,
=3÷0.2,
=15;
(3)
4 |
33 |
2 |
11 |
=(
4 |
33 |
33 |
2 |
2 |
11 |
33 |
2 |
=2:3;
4 |
33 |
2 |
11 |
=
4 |
33 |
2 |
11 |
=
2 |
3 |
(4)1:0.125,
=1:
1 |
8 |
=(1×8):(
1 |
8 |
=8:1;
1:0.125,
=1÷0.125,
=8.
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