Question

Очень срочно нужно я не поняла как сделать.Плизззз.

Answer 1

а) a/a²-9 + 3/a²-9 = a+3/a²-9 = a+3/(a-3)(a+3) = 1/a-3

б) x²/x-4 - 16/x-4 = x²-16/x-4 = (x-4)(x+4)/x-4 = x+4

в) 5m/m²-n² + 5n/m²-n² = 5m+5n/(m-n)(m+n) = 5(m+n)/(m-n)(m+n) = 5/m-n

г) 6/b²-9 - 2b/b²-9 = 6-2b/(b-3)(b+3) = 2(3-b)/(b-3)(b+3) = -2(b-3)/(b-3)(b+3) = -2/b+3

д) a²/a²-9b² + 6ab+9b²/a²-9b² = a²-6ab+9b²/(a-3b)(a+3b)=(a-3b)²/(a-3b)(a+3b)=a-3b/a+3b

е) y²-7y/y²-1 - 5y-1/y²-1 = y²-7y-5y+1/(y-1)(y+1) = y²-2y+1/(y-1)(y+1) = (y-1)²/(y-1)(y+1) = y-1/y+1

ж) a²+3a/a-1 + 2a-6/a-1 = a²+3a+2a-6/a-1 = a²+5a-6/a-1 = a²+6a-a-6/a-1 = a(a+6)-(a+6)/a-1 = (a+6)(a-1)/a-1 = a+6

з) x²/x²-4x+3 - 1/x²-4x+3 = x²-1/x²-3x-x+3 = (x-1)(x+1)/x(x-1)-3(x-1) = (x-1)(x+1)/(x-1)(x+3) = x+1/x+3