Упростить выражения:
1. [tex] x-y-\frac{x^2+y^2}{x-y}
[/tex]
2. [tex] \frac{a^2+b^2}{a+b}-a-b
[/tex]
1. [tex] x-y-\frac{x^2+y^2}{x-y}
[/tex]
2. [tex] \frac{a^2+b^2}{a+b}-a-b
[/tex]
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Answers & Comments
= [(x-y)^2 -x^2 -y^2]/(x-y) = (x^2 -2xy +y^2 -x^2 -y^2)/(x-y) = -2xy/(x-y) = 2xy/(y-x)
2) (a^2 +b^2)/(a+b) -a -b =
= [a^2 +b^2 -(a+b)^2]/(a+b) = (a^2 +b^2 -a^2 -2ab -b^2)/(a+b) = -2ab/(a+b)