题目内容
| 求未知数x x+
|
|
|
|
(1)x+
x=24,
(1+
)x=24,
x=24,
x×
=24×
,
x=18;
(2)
x=70%÷
,
x=
×2,
x=
,
x×5=
×5,
x=7;
(3)
=
,
2x=5×1.8,
2x÷2=5×1.8÷2,
x=4.5;
(4)
:
=x:
,
x=
×
,
x×2=
×
×2,
x=
.
| 1 |
| 3 |
(1+
| 1 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
x=18;
(2)
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
| 7 |
| 10 |
| 1 |
| 5 |
| 7 |
| 5 |
| 1 |
| 5 |
| 7 |
| 5 |
x=7;
(3)
| x |
| 5 |
| 1.8 |
| 2 |
2x=5×1.8,
2x÷2=5×1.8÷2,
x=4.5;
(4)
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 5 |
x=
| 4 |
| 15 |
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