题目内容
解方程.
(1)60%x÷
=
;
(2)
×(x+
)=
.
(1)60%x÷
6 |
25 |
5 |
4 |
(2)
1 |
8 |
1 |
2 |
3 |
4 |
分析:(1)依据等式的性质,方程两边同时乘
,再同时除以60%求解,
(2)依据等式的性质,方程两边同时除以
,再同时减
求解.
6 |
25 |
(2)依据等式的性质,方程两边同时除以
1 |
8 |
1 |
2 |
解答:解:(1)60%x÷
=
,
60%x÷
×
=
×
,
60%x=
,
60%x÷60%=
÷60%,
x=
;
(2)
×(x+
)=
,
×(x+
)÷
=
÷
,
x+
=6,
x+
-
=6-
,
x=5.5.
6 |
25 |
5 |
4 |
60%x÷
6 |
25 |
6 |
25 |
5 |
4 |
6 |
25 |
60%x=
3 |
10 |
60%x÷60%=
3 |
10 |
x=
1 |
2 |
(2)
1 |
8 |
1 |
2 |
3 |
4 |
1 |
8 |
1 |
2 |
1 |
8 |
3 |
4 |
1 |
8 |
x+
1 |
2 |
x+
1 |
2 |
1 |
2 |
1 |
2 |
x=5.5.
点评:本题主要考查学生依据等式的性质解方程的能力.
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