题目内容
计算:(
)-1÷(
•
)-5.
| x2+xy |
| x |
| x-y |
| x |
| x |
| y-x |
(
)-1÷(
•
)-5
=[
]-1÷(
•
)-5
=(x+y)-1•(-1)5
=-
| x2+xy |
| x |
| x-y |
| x |
| x |
| y-x |
=[
| x(x+y) |
| x |
| x-y |
| x |
| -x |
| x-y |
=(x+y)-1•(-1)5
=-
| 1 |
| x+y |
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