题目内容
解下列方程.
①
x=
×
②1-
x=
③x÷
=
÷
.
①
| 10 |
| 27 |
| 5 |
| 18 |
| 22 |
| 45 |
②1-
| 3 |
| 10 |
| 14 |
| 15 |
③x÷
| 4 |
| 5 |
| 15 |
| 52 |
| 21 |
| 26 |
分析:(1)先化简,再根据等式的性质,在方程两边同时乘上
来解.
(2)根据等式的性质,在方程两边同时加上
x,再减去
,最后乘上
来解.
(3)先化简,再根据等式的性质,在方程两边同时乘上
来解.
| 27 |
| 10 |
(2)根据等式的性质,在方程两边同时加上
| 3 |
| 10 |
| 14 |
| 15 |
| 10 |
| 3 |
(3)先化简,再根据等式的性质,在方程两边同时乘上
| 4 |
| 5 |
解答:解:(1)
x=
×
,
x=
,
x×
=
×
,
x=
;
(2)1-
x=
1-
x+
x=
+
x,
+
x= 1,
+
x-
= 1-
,
x×
=
×
,
x=
;
(3)x÷
=
÷
,
x÷
=
,
x÷
×
=
×
,
x=
.
| 10 |
| 27 |
| 5 |
| 18 |
| 22 |
| 45 |
| 10 |
| 27 |
| 11 |
| 81 |
| 10 |
| 27 |
| 27 |
| 10 |
| 11 |
| 81 |
| 27 |
| 10 |
x=
| 11 |
| 30 |
(2)1-
| 3 |
| 10 |
| 14 |
| 15 |
1-
| 3 |
| 10 |
| 3 |
| 10 |
| 14 |
| 15 |
| 3 |
| 10 |
| 14 |
| 15 |
| 3 |
| 10 |
| 14 |
| 15 |
| 3 |
| 10 |
| 14 |
| 15 |
| 14 |
| 15 |
| 3 |
| 10 |
| 10 |
| 3 |
| 1 |
| 15 |
| 10 |
| 3 |
x=
| 2 |
| 9 |
(3)x÷
| 4 |
| 5 |
| 15 |
| 52 |
| 21 |
| 26 |
x÷
| 4 |
| 5 |
| 5 |
| 14 |
x÷
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 14 |
| 4 |
| 5 |
x=
| 2 |
| 7 |
点评:本题考查了学生利用等式的性质解方程的能力,注意等号要对齐.
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