一到数学填空题
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一到数学填空题
一到数学填空题
一到数学填空题
(x-y)/(x+y)=(x-y)^2/(x^2-y^2)
=>
M/(x^2-y^2)=((2xy-y^2)+(x-y)^2)/(x^2-y^2)
=>
M=2xy-y^2+(x-y)^2=x^2
=》M=x^2
x2(x的平方)
x
由题意可知x²-y²≠0,估原等式两边同时乘以(x²-y²)得
M=(2xy-y²)+(x-y)(x-y)=2xy-y²+x²-2xy+y²=x²
故空处填x²