题目内容
解方程.
(1)x:
=40%
(2)
-2x=
(3)
÷x=
(4)
(x-4.5)=7.
(1)x:
| 1 |
| 7 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
(3)
| 12 |
| 5 |
| 3 |
| 10 |
(4)
| 2 |
| 3 |
解(1)x:
=40%,
x=
×40%,
x=
;
(2)
-2x=
,
2x=
-
,
2x=
,
x=
÷2,
x=
;
(3)
÷x=
,
x=
÷
,
x=
×
,
x=8;
(4))
(x-4.5)=7,
x-4.5=7÷
,
x-4.5=
,
x=4.5+
,
x=15.
| 1 |
| 7 |
x=
| 1 |
| 7 |
x=
| 2 |
| 35 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
2x=
| 3 |
| 4 |
| 5 |
| 8 |
2x=
| 1 |
| 8 |
x=
| 1 |
| 8 |
x=
| 1 |
| 16 |
(3)
| 12 |
| 5 |
| 3 |
| 10 |
x=
| 12 |
| 5 |
| 3 |
| 10 |
x=
| 12 |
| 5 |
| 10 |
| 3 |
x=8;
(4))
| 2 |
| 3 |
x-4.5=7÷
| 2 |
| 3 |
x-4.5=
| 21 |
| 2 |
x=4.5+
| 21 |
| 2 |
x=15.
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