题目内容
(2010?安岳县)如果4X+3Y=
,那么X+
Y=
.当Y=
时,X=
.
| 7 |
| 8 |
| 3 |
| 4 |
| 7 |
| 32 |
| 7 |
| 32 |
| 1 |
| 5 |
| 11 |
| 160 |
| 11 |
| 160 |
分析:等式的两边同时除以4,即可求得X+
Y的值;
将Y=
代入4X+3Y=
,解方程即可求解.
| 3 |
| 4 |
将Y=
| 1 |
| 5 |
| 7 |
| 8 |
解答:解:4X+3Y=
,
两边同时除以4,得X+
Y=
÷4=
;
当Y=
时,
4X+3×
=
,
4X+
=
,
4X+
-
=
-
,
4X÷4=
÷4,
X=
.
故答案为:
;
.
| 7 |
| 8 |
两边同时除以4,得X+
| 3 |
| 4 |
| 7 |
| 8 |
| 7 |
| 32 |
当Y=
| 1 |
| 5 |
4X+3×
| 1 |
| 5 |
| 7 |
| 8 |
4X+
| 3 |
| 5 |
| 7 |
| 8 |
4X+
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 8 |
| 3 |
| 5 |
4X÷4=
| 11 |
| 40 |
X=
| 11 |
| 160 |
故答案为:
| 7 |
| 32 |
| 11 |
| 160 |
点评:本题主要考查等式的性质和解方程.
练习册系列答案
相关题目