题目内容
方程:
+
+
=3,abc≠0,则x=______.
| x-a-b |
| c |
| x-b-c |
| a |
| x-c-a |
| b |
∵
+
+
=3
?
-
-1+
-
-1+
-
-1=0
x(
+
+
)-(a+b+c)(
+
+
)=0
[x-(a+b+c)](
+
+
)=0
∵
+
+
是一元一次方程的系数
∴必然是
+
+
≠0
∴只能是x=a+b+c
故答案为a+b+c
| x-a-b |
| c |
| x-b-c |
| a |
| x-c-a |
| b |
?
| x |
| c |
| a+b |
| c |
| x |
| a |
| b+c |
| a |
| x |
| b |
| c+a |
| b |
x(
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
[x-(a+b+c)](
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
∵
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
∴必然是
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
∴只能是x=a+b+c
故答案为a+b+c
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