题目内容
解方程.
| (
| ||||||||||
| 8(
|
(1)
x-
+
=1,
x-
+
=1+
,
x=
,
x÷
=
÷
,
x=1
;
(2)(
+3.2)x=
,
4x=
,
4x÷4=
÷4,
x=
;
(3)
+0.4x=
,
+0.4x-
=
-
,
0.4x=
,
0.4x÷0.4=
÷0.4,
x=
;
(4)8(
x-2.5)=14,
8(
x-2.5)÷8=14÷8,
x-2.5+2.5=
+2.5,
x=
,
x÷
=
÷
,
x=17.
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
| 3 |
| 5 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 7 |
| 3 |
| 5 |
| 8 |
| 7 |
| 3 |
| 5 |
| 3 |
| 5 |
| 8 |
| 7 |
| 3 |
| 5 |
x=1
| 19 |
| 21 |
(2)(
| 4 |
| 5 |
| 2 |
| 3 |
4x=
| 2 |
| 3 |
4x÷4=
| 2 |
| 3 |
x=
| 1 |
| 6 |
(3)
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
0.4x=
| 1 |
| 8 |
0.4x÷0.4=
| 1 |
| 8 |
x=
| 5 |
| 16 |
(4)8(
| 1 |
| 4 |
8(
| 1 |
| 4 |
| 1 |
| 4 |
| 14 |
| 8 |
| 1 |
| 4 |
| 17 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 17 |
| 4 |
| 1 |
| 4 |
x=17.
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