题目
题型:解答题难度:一般来源:呼和浩特
M |
x2-y2 |
2xy-y2 |
x2-y2 |
x-y |
x+y |
答案
M |
x2-y2 |
2xy-y2 |
x2-y2 |
(x-y)2 |
x2-y2 |
M |
x2-y2 |
2xy-y2+x2-2xy+y2 |
x2-y2 |
即
M |
x2-y2 |
x2 |
x2-y2 |
∴M=x2.
核心考点
举一反三
A.
| B.
| ||||||||||||
C.
| D.
|
M |
x2-y2 |
2xy-y2 |
x2-y2 |
x-y |
x+y |
M |
x2-y2 |
2xy-y2 |
x2-y2 |
(x-y)2 |
x2-y2 |
M |
x2-y2 |
2xy-y2+x2-2xy+y2 |
x2-y2 |
M |
x2-y2 |
x2 |
x2-y2 |
A.
| B.
| ||||||||||||
C.
| D.
|