题目内容
解比例. 5.4:1.8=x:15 |
8:x=
| ||||||||
|
|
(1)5.4:1.8=x:15,
1.8x=5.4×15,
1.8x=81,
1.8x÷1.8=81÷1.8,
x=45;
(2)8:x=
:
,
x=8×
,
x=
,
x÷
=
÷
,
x=
;
(3)
=
,
15x=7×75,
15x=525,
15x÷15=525÷15,
x=35;
(4)
:
=4:x,
x=
×4,
x=
,
x÷
=
÷
,
x=
.
1.8x=5.4×15,
1.8x=81,
1.8x÷1.8=81÷1.8,
x=45;
(2)8:x=
1 |
3 |
1 |
16 |
1 |
3 |
1 |
16 |
1 |
3 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
2 |
1 |
3 |
x=
3 |
2 |
(3)
7 |
15 |
x |
75 |
15x=7×75,
15x=525,
15x÷15=525÷15,
x=35;
(4)
1 |
3 |
2 |
5 |
1 |
3 |
2 |
5 |
1 |
3 |
8 |
5 |
1 |
3 |
1 |
3 |
8 |
5 |
1 |
3 |
x=
24 |
5 |
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解比例.
5.4:1.8=x:15 | 8:x=: |
= | :=4:x. |