please bantuin kk, beserta rumusnya

Nomor 3
a. x^2 - 25 / 5x^2 -+ x - 30
= ( x - 5 ) ( x + 5 ) / ( 5x + 6 ) ( x - 5 )
= ( 5 + 5 ) / ( 5(5) + 6 )
= 10 / 31
b. 2x - 1 / 4x^2 - 1
= 2x - 1 / ( 2x - 1 )(2x+1 ) = 1 / 2(1/2) + 1
= 1 / 2
c. 3/ 3(x + 3 ) - (x + 3 ) / 3(x + 3) / x
= -3x / 3(x + 3 ) . 1 / x
= -3 / 3 ( 0 + 3 ) = - 3/9 ( -1/3)

Nomor 4
a. 3+x-2x / 3 - x ( akar 3 + x + akar 2x)
= 1 / ( akar 3+3 + akar2.3 )
= 1 / 2 akar 6
b. X - 1 ( u ) / x2 +3x - 4
= ( x - 1 ) u / ( x - 1 )(x + 4 )
=( akar 1 + 3 )+ 4 / 5
= 2 + 4 / 5 = (6/5)
C. Misalkan atasnya itu u bawahnya v maka =
U^1/2 - 2 . U^1/2 + 2 / u^1/2 -2
= 2x^2 - 4x - 4/ (2x -4 )^2 - 4
X (2x - 4 ) -4 /(2x -4 )^2 - 4
X - 4 / 2x - 4 - 4
0 / 8 = 0

Itu dulu saja . Maaf kalo salah