Mohon batuannya. Besok di kumpul. Thanks. PAKAI CARA!

1. a/b – b/a ÷ 1 + b/a
= a² – b² / ab ÷ a+b /a
=a²-b²/ ab × a/a+b
=(a+b)(a-b) / ab × a/a+b
=a(a-b)/ab
=a-b/b

2.1/x+y +1/x-y
=(x-y)+(x+y) / x²-y²
=x-y+x+y /x²-y²
=2x /x²-y²