题目内容
解方程或比例:
x:
=
:4
x+
=
15:7=x:1.4.
x:
| 3 |
| 8 |
| 2 |
| 3 |
| 1 |
| 8 |
| 7 |
| 8 |
| 31 |
| 32 |
(1)x:
=
:4,
4x=
×
,
4x÷4=
÷4,
x=
;
(2)
x+
=
,
x+
-
=
-
,
x÷
=
÷
,
x=
;
(3)15:7=x:1.4,
7x=15×1.4,
7x÷7=21÷7,
x=3.
| 3 |
| 8 |
| 2 |
| 3 |
4x=
| 3 |
| 8 |
| 2 |
| 3 |
4x÷4=
| 1 |
| 4 |
x=
| 1 |
| 16 |
(2)
| 1 |
| 8 |
| 7 |
| 8 |
| 31 |
| 32 |
| 1 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 31 |
| 32 |
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 3 |
| 32 |
| 1 |
| 8 |
x=
| 3 |
| 4 |
(3)15:7=x:1.4,
7x=15×1.4,
7x÷7=21÷7,
x=3.
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