题目内容
解方程.
| 9-0.4x=3.8 | 2-
|
|
(1)9-0.4x=3.8,
9-0.4x+0.4x=3.8+0.4x,
3.8+0.4x=9,
3.8+0.4x-3.8=9-3.8,
0.4x=5.2,
0.4x÷0.4=5.2÷0.4,
x=13;
(2)2-
x=
,
2-
x+
x=
+
x,
+
x=2,
+
x-
=2-
,
x=
,
x×
=
×
,
x=
;
(3)
x+
x=
,
(
+
)x=
,
x=
,
x×
=
×
,
x=
.
9-0.4x+0.4x=3.8+0.4x,
3.8+0.4x=9,
3.8+0.4x-3.8=9-3.8,
0.4x=5.2,
0.4x÷0.4=5.2÷0.4,
x=13;
(2)2-
| 3 |
| 4 |
| 3 |
| 5 |
2-
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 4 |
| 7 |
| 5 |
| 3 |
| 4 |
| 4 |
| 3 |
| 7 |
| 5 |
| 4 |
| 3 |
x=
| 28 |
| 15 |
(3)
| 3 |
| 4 |
| 1 |
| 2 |
| 15 |
| 16 |
(
| 3 |
| 4 |
| 1 |
| 2 |
| 15 |
| 16 |
| 5 |
| 4 |
| 15 |
| 16 |
| 5 |
| 4 |
| 4 |
| 5 |
| 15 |
| 16 |
| 4 |
| 5 |
x=
| 3 |
| 4 |
练习册系列答案
相关题目