题目内容
| 3 |
| 4 |
| 1 |
| 0.25 |
| 1 |
| 4 |
| 0.75 |
| x |
12.6:0.4(化简比)
2.8:4=0.7:X
X:21=5:63.
(1)
千米:500米,
=750米:500米,
=750÷500,
=1.5,
(2)
=(1÷0.25):(0.25÷0.25),
=4:1
(3)
=
,
x=4×0.75,
x=3,
(4)12.6:0.4,
=(12.6÷0.2):(0.4÷0.2),
=63:2,
(5)2.8:4=0.7:X,
2.8X=4×0.7,
2.8X÷2.8=2.8÷2.8,
X=1,
(6)X:21=5:63,
63X=21×5,
63X÷63=105÷63,
X=
.
| 3 |
| 4 |
=750米:500米,
=750÷500,
=1.5,
(2)
| 1 |
| 0.25 |
=(1÷0.25):(0.25÷0.25),
=4:1
(3)
| 1 |
| 4 |
| 0.75 |
| x |
x=4×0.75,
x=3,
(4)12.6:0.4,
=(12.6÷0.2):(0.4÷0.2),
=63:2,
(5)2.8:4=0.7:X,
2.8X=4×0.7,
2.8X÷2.8=2.8÷2.8,
X=1,
(6)X:21=5:63,
63X=21×5,
63X÷63=105÷63,
X=
| 5 |
| 3 |
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