Question

(x-   x^2-y^2 дробь x-y) (y+   x^2-y^2 дробь x+y) упростите выражение x-    и     y+    не входят в дробь

Answer 1

(x-(x^2-y^2)/(x-y))•(y+(x^2-y^2)/(x+y))=
=(x-(x-y)(x+y)/(x-y))•(y+(x-y)(x+y)/(x+y))=
=(x-(x-y))•(y+(x-y))=y•x