题目内容
解方程
x+
=
-x=
5x-
=
x-
=1-
.
x+
| 1 |
| 4 |
| 11 |
| 20 |
| 3 |
| 4 |
| 3 |
| 20 |
5x-
| 3 |
| 7 |
| 4 |
| 7 |
x-
| 3 |
| 5 |
| 3 |
| 5 |
考点:方程的解和解方程
专题:简易方程
分析:(1)根据等式的性质,两边同减去
即可;
(2)根据等式的性质,两边同加上x,得
+x=
,两边同减去
即可;
(3)根据等式的性质,两边同加上
再同除以5即可;
(4)先化简方程得x-
=
,再根据等式的性质,两边同加上
即可.
| 1 |
| 4 |
(2)根据等式的性质,两边同加上x,得
| 3 |
| 20 |
| 3 |
| 4 |
| 3 |
| 20 |
(3)根据等式的性质,两边同加上
| 3 |
| 7 |
(4)先化简方程得x-
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
解答:
解:(1)x+
=
x+
-
=
-
x=
;
(2)
-x=
-x+x=
+x
+x=
+x-
=
-
x=
;
(3)5x-
=
5x-
+
=
+
5x=1
5x÷5=1÷5
x=
;
(4)x-
=1-
x-
=
x-
+
=
+
x=1.
| 1 |
| 4 |
| 11 |
| 20 |
x+
| 1 |
| 4 |
| 1 |
| 4 |
| 11 |
| 20 |
| 1 |
| 4 |
x=
| 3 |
| 10 |
(2)
| 3 |
| 4 |
| 3 |
| 20 |
| 3 |
| 4 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 4 |
| 3 |
| 20 |
| 3 |
| 20 |
| 3 |
| 4 |
| 3 |
| 20 |
x=
| 3 |
| 5 |
(3)5x-
| 3 |
| 7 |
| 4 |
| 7 |
5x-
| 3 |
| 7 |
| 3 |
| 7 |
| 4 |
| 7 |
| 3 |
| 7 |
5x=1
5x÷5=1÷5
x=
| 1 |
| 5 |
(4)x-
| 3 |
| 5 |
| 3 |
| 5 |
x-
| 3 |
| 5 |
| 2 |
| 5 |
x-
| 3 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
x=1.
点评:此题考查了根据等式的性质解方程,即等式两边同加上、同减去、同乘上或同除以一个不为0的数,等式仍相等.同时注意“=”上下要对齐.
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