24*(1/2)² + 2*(1/2) =
=24:4 +1 = 7
(b/(a² + ab)):b²/(a²-b²) =
(b/a(a + b)):b²/(a-b)(a + b)=
= (a-b)/ab =(-2)/(√5 - 1)(√5 + 1) =-0.5
где:
(√5 - 1)(√5 + 1) = (√5)²-1² 5-1 =4
2 вариант
1.
2*(0.5)² -9*0.5 =
=2*(0.25) -4.5 =
=0.5 - 4.5 = -4
2.
(1/y - 1/(x+y))*(x² - y²)/x =
=((x² - y²)/y -(x-y))/x =
= ((x² - y²) - y(x-y))/xy =
= (x²- xy)/xy = x/y -1 =
= 1/(-0.2) - 1 = -6