题目内容
解方程或比例.
| 14.2-
|
|
(1)
=
,
48x=36×20,
48x÷48=720÷48,
x=15;
(2)14.2-
x=4.5,
14.2-
x+
x=4.5+
x,
14.2=4.5+
x,
14.2-4.5=4.5+
x-4.5,
9.7=
x,
9.7÷
=
x÷
,
x=24.25;
(3)
:
=
:x,
x=
×
,
x÷
=
×
÷
,
x=
.
| 36 |
| 48 |
| x |
| 20 |
48x=36×20,
48x÷48=720÷48,
x=15;
(2)14.2-
| 2 |
| 5 |
14.2-
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
14.2=4.5+
| 2 |
| 5 |
14.2-4.5=4.5+
| 2 |
| 5 |
9.7=
| 2 |
| 5 |
9.7÷
| 2 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
x=24.25;
(3)
| 3 |
| 7 |
| 2 |
| 7 |
| 4 |
| 7 |
| 3 |
| 7 |
| 2 |
| 7 |
| 4 |
| 7 |
| 3 |
| 7 |
| 3 |
| 7 |
| 2 |
| 7 |
| 4 |
| 7 |
| 3 |
| 7 |
x=
| 8 |
| 21 |
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