⇢ VK
Vladimir Kir'yazev
мне срочно нужны решения!!!!
я не понимаю напишите решения пожалуйста!!!!
Ира Ситникова
Так решай, проблема-то в чем?
АК
Анютка Крошка
Ответ
1) (1 - b^2) * [1/(b-1)^2 - 1/(1-b^2)] + 2b/(1+b) =
= (1-b^2) * [(1/(b-1)^2 + 1/(b^2-1)] + 2b/(1+b) =
= (1-b^2) * [1/(b-1)^2 + 1/(b-1)(b+1)] + 2b/(1+b) =
= (-1)*(b+1)(b-1) * [(b+1) + (b-1)] / [(b-1)^2*(b+1)] + 2b/(1+b) =
= (-1)* 2b / (b-1) + 2b/(1+b) =
= 2b / (1-b) + 2b/(1+b) =
= 2b*[(1+b) + (1-b)] / (1-b)(1+b) =
= 2b/(1-b^2)
3) (y+V6) / (y^2-6) = (y+V6) / (y+V6)(y-V6) = 1/(y-V6)
4) 3V6 - V24 + V(1/6) + 3V(2/3) - 5V(3/2) = =>
__V24 = V(4*6) = V4 * V6 = 2V6
__V(1/6) = V1 / V6 = V1/V6 * V6/V6 = V6/6
__3V(2/3) = 3*V2/V3 * (V3/V3) = 3V6/3 = V6
__5V(3/2) = 5*V3/V2 * (V2/V2) = 5V6/2
=>
= 3V6 - 2V6 - V6/6 + V6 - 5V6/2 =
= V6 * (2 - 1/6 - 5/2) =
= V6 * (12 - 1 - 15)/6 = (-4)V6/6 = - 2V6/3
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