Question

$\frac{a}{b-a} +\frac{b^{2} -3ab}{b^{2}-a^{2} }$

Answer 1

а/b-a + b^2-3ad/(b-a)(b+a)
a(b-a)+b^2-3ad/(b-a)(b+a)
ad+a^2+b^2-3ad/(b-a)(b+a)
-2ad+a^2+b^2/-(a-b)(b+a)
a^2-2ab+b^2/-(a-b)(b+a)
(a-b)^2/-(a-b)(b+a)
-a-b/b+a