题目内容
解方程
x÷
=
x+
=
x×
=
3x-
=
.
x÷
| 6 |
| 25 |
| 5 |
| 12 |
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
x×
| 7 |
| 18 |
| 14 |
| 27 |
3x-
| 6 |
| 7 |
| 3 |
| 14 |
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,方程两边同时乘上
求解;
(2)依据等式的性质,方程两边同时减去
再同时乘上4求解;
(3)依据等式的性质,方程两边同时乘上
求解;
(4)依据等式的性质,方程两边同时加上
再同时除以3求解;
| 6 |
| 25 |
(2)依据等式的性质,方程两边同时减去
| 3 |
| 4 |
(3)依据等式的性质,方程两边同时乘上
| 18 |
| 7 |
(4)依据等式的性质,方程两边同时加上
| 6 |
| 7 |
解答:
解:(1)x÷
=
x÷
×
=
×
x=
;
(2)
x+
=
x+
-
=
-
x=
x×4=
×4
x=
;
(3)x×
=
x×
×
=
×
x=
;
(4)3x-
=
3x-
+
=
+
3x=
3x÷3=
÷3
x=
.
| 6 |
| 25 |
| 5 |
| 12 |
x÷
| 6 |
| 25 |
| 6 |
| 25 |
| 5 |
| 12 |
| 6 |
| 25 |
x=
| 1 |
| 10 |
(2)
| 1 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 4 |
| 1 |
| 12 |
x=
| 1 |
| 3 |
(3)x×
| 7 |
| 18 |
| 14 |
| 27 |
x×
| 7 |
| 18 |
| 18 |
| 7 |
| 14 |
| 27 |
| 18 |
| 7 |
x=
| 4 |
| 3 |
(4)3x-
| 6 |
| 7 |
| 3 |
| 14 |
3x-
| 6 |
| 7 |
| 6 |
| 7 |
| 3 |
| 14 |
| 6 |
| 7 |
3x=
| 15 |
| 14 |
3x÷3=
| 15 |
| 14 |
x=
| 5 |
| 14 |
点评:本题考查了依据等式的性质解方程,解方程时注意对齐等号.
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