题目内容
解一元一次方程:
(1)
-
-2x=5x;
(2)x+
+3x-
=1;
(3)x-
-1=2-
+2;
(4)
+1=
-x+
+5.
(1)
| 5x |
| 2 |
| 1 |
| 0.2 |
(2)x+
| 1 |
| 2 |
| 3 |
| 6 |
(3)x-
| x |
| 2 |
| x |
| 3 |
(4)
| 3x |
| 0.5 |
| 4 |
| 0.3 |
| 3x |
| 1.5 |
考点:解一元一次方程
专题:
分析:根据一元一次方程的解法逐一解答即可.
解答:解:(1)
-
-2x=5x
-5-2x=5x
-2x-5x=5
-
x=5
x=-
;
(2)x+
+3x-
=1
x+3x=1-
+
4x=1
x=
;
(3)x-
-1=2-
+2
x-
+
=2+2+1
x=5
x=6;
(4)
+1=
-x+
+5
18x+3=40-3x+6x+15
18x+3x-6x=40+15-3
15x=52
x=
.
| 5x |
| 2 |
| 1 |
| 0.2 |
| 5x |
| 2 |
| 5x |
| 2 |
-
| 9 |
| 2 |
x=-
| 10 |
| 9 |
(2)x+
| 1 |
| 2 |
| 3 |
| 6 |
x+3x=1-
| 1 |
| 2 |
| 3 |
| 6 |
4x=1
x=
| 1 |
| 4 |
(3)x-
| x |
| 2 |
| x |
| 3 |
x-
| x |
| 2 |
| x |
| 3 |
| 5 |
| 6 |
x=6;
(4)
| 3x |
| 0.5 |
| 4 |
| 0.3 |
| 3x |
| 1.5 |
18x+3=40-3x+6x+15
18x+3x-6x=40+15-3
15x=52
x=
| 52 |
| 15 |
点评:本题考查了一元一次方程的解法.解一元一次方程常见的过程有去括号、移项、系数化为1等.
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