Question

4. Упростить выражения:

Answer 1

(3d+1)/(2d+2)-1=[3d+1-2d-2]/(2d+2)=[d-1]/2(d+1)
[d-1]/2(d+1)*(d+1)/6(d-1)=1/12

6x+1     6x-1         6x²+19x+3+6x²-19x +3          12x²+6
------  +  -------- = ----------------------------------- = ---------------------
x-3          x+3                    x²-9                              x²-9

6(2x²+1)        x²-9
------------ * --------------- = 6
x²-9                2x²+1