√b +√a √b-√a b+a (√b +√a )(√b +√a ) -(√b -√a )(√b -√a )
(--------- - ------------ ) * -------- = (-------------------------------------------------------------- ) *
√b-√a √b+√a √ab (√b +√a )(√b -√a )
b+a b+2√a√b+a-b+2√a√b-a b-a 4√ab b-a
* ------- = (---------------------------------------) * --------- = ---------- * ---------- = 4
√ab b-a √ab b-a √ab
2х+1 4х+2 2х+1 2
(------- - ---------- ) : --------- + ------- =1
х+2 4-х² х-2 х+2
1) (2х+1)(2-х) -2(2х+1) (2х+1)(2-х-2)
----------------------------- = ---------------------
(2-х)(2+х) (2-х)(2+х)
2) (2х+1)(-х) 2х+1 (2х+1)(-х) -(2-х) х
------------------- : -------- = ------------------ * ------------ = -------------
(2-х)(2+х) х-2 (2-х)(2+х) (2х+1) 2+х
3) х 2 (х+2)
------- + ------- = --------- = 1
2+х х+2 (х+2)
(a+b)³-(a-b)³ a³+3a²b+3ab²+b³-(a³-3a²b+3ab²-b³)
----------------- +1 = ---------------------------------------------------------------- + 1 =
2b(3a²+b²) 6a²b+2b³
a³+3a²b+3ab²+b³-a³+3a²b-3ab²+b³ 6a²b+2b³
= ---------------------------------------------------- +1 = ------------------------ +1 = 1+1=2
6a²b+2b³ 6a²b+2b³