题目内容
解方程.
x-
=
+
;
x+
=
; 2x÷
=
.
x-
| 6 |
| 7 |
| 3 |
| 7 |
| 2 |
| 7 |
| 3 |
| 4 |
| 1 |
| 8 |
| 3 |
| 8 |
| 5 |
| 6 |
| 2 |
| 3 |
考点:方程的解和解方程
专题:简易方程
分析:①依据等式的性质,先化简方程,方程两边同时加上
求解;
②依据等式的性质,方程两边同时减去
,再同时乘
求解;
③依据等式的性质,先化简方程,再方程两边同时乘
求解.
| 6 |
| 7 |
②依据等式的性质,方程两边同时减去
| 1 |
| 8 |
| 4 |
| 3 |
③依据等式的性质,先化简方程,再方程两边同时乘
| 5 |
| 12 |
解答:
解:①x-
=
+
x-
=
x-
+
=
+
x=
②
x+
=
x+
-
=
-
x×
=
×
x=
③2x÷
=
x=
x×
=
×
x=
| 6 |
| 7 |
| 3 |
| 7 |
| 2 |
| 7 |
x-
| 6 |
| 7 |
| 5 |
| 7 |
x-
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 7 |
| 6 |
| 7 |
x=
| 11 |
| 7 |
②
| 3 |
| 4 |
| 1 |
| 8 |
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 3 |
| 8 |
| 1 |
| 8 |
| 3 |
| 4 |
| 4 |
| 3 |
| 1 |
| 4 |
| 4 |
| 3 |
x=
| 1 |
| 3 |
③2x÷
| 5 |
| 6 |
| 2 |
| 3 |
| 12 |
| 5 |
| 2 |
| 3 |
| 12 |
| 5 |
| 5 |
| 12 |
| 2 |
| 3 |
| 5 |
| 12 |
x=
| 5 |
| 18 |
点评:此题考查了运用等式的性质解方程,即等式两边同加上或同减去、同乘上或同除以一个数(0除外),两边仍相等,同时注意“=”上下要对齐.
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