Question

Pomoc z matematyki :))

Answer 1

1) (a-2b-3)/(2a-b)

po podstaiweniu za a i b:

(3-2*(-2)-3)/(2*3 -(-2))= (3+4-3)/(6+2) = 4/8 = 1/2

 

2) (7a)/(a+b) *(-1)/(5a+1)

po podstaiweniu za a i b:

(7*3)/(3-2) * (-1)/(5*3 +1) = 21/1 * (-1)/16 = - 21/16

 

3) (a+4)/(a+|b|) * (-2b+3)/(a-1)

po podstaiweniu za a i b:

(3+4)/(3+|-2|) * (-2*(-2) +3)/(3-1) = 7/(3+2) * (4+3)/2 = 7/5 * 7/2 = 49/10

 

4) (2a+sqrt(3))/(4*sqrt(5+b)) * (3a+2b)/(s*sqrt(5+a))

po podstaiweniu za a i b:

(2*3 +sqrt(3))/(4*sqrt(5-2)) * (3*3+2*(-2))/(6*sqrt(5+3)) =

= (6+sqrt(3))/ (4*sqrt(3)) * (9-4)/ (6*sqrt(8)) =

            (6+sqrt(3)) * 5                 30+5*sqrt(3)

= ---------------------------------- = -------------------- mnożąc licznik i mianownik *sqrt(6)

     4*sqrt(3)) * (6*2*sqrt(2))        48*sqrt(6)

 

     30+5*sqrt(3)  *sqrt(6)      30*sqrt(6) + 5*sqrt(18)        30*sqrt(6) + 15*sqrt(2)

=  ------------------------------  = -------------------------------- = ---------------------------------

       48*sqrt(6) * sqrt(6)             48 * 6                                                  288

 

 

   10*sqrt(6) +5*sqrt(2)

 = -----------------------------

           96