题目内容
解方程.
(1)
+6=7
(2)x:
=0.4x+12.
(1)
| x |
| 5 |
| 1 |
| 2 |
(2)x:
| 10 |
| 7 |
(1)
+6=7
,
+6-6=7
-6,
×5=1
×5,
x=7
;
(2)x:
=0.4x+12,
×(0.4x+12)=x,
x+17
=x,
x+17
-
x=x-
x,
17
×
=
x×
,
x=40.
| x |
| 5 |
| 1 |
| 2 |
| x |
| 5 |
| 1 |
| 2 |
| x |
| 5 |
| 1 |
| 2 |
x=7
| 1 |
| 2 |
(2)x:
| 10 |
| 7 |
| 10 |
| 7 |
| 4 |
| 7 |
| 1 |
| 7 |
| 4 |
| 7 |
| 1 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
17
| 1 |
| 7 |
| 7 |
| 3 |
| 3 |
| 7 |
| 7 |
| 3 |
x=40.
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