jawab ya. poinnya lumayan tuh please jawab pakai cara kalo ketahuan salah gue lapor

Bab Aljabar
Matematika SMP Kelas VIII

4] (2a/3x) . ((2x - 6xy)/(12a)) = (2a/12a) . (2x (1 - 3y)/3x)
                                              = (1/6) .(2(1 - 3y)/3)
                                              = (1/3) . (1 - 3y)/3
                                              = (1 - 3y)/9

5] (12 / ((x - 3) (x + 3))) : (3 / (x + 3)) = (12 / ((x - 3) (x + 3))) . ((x + 3)/3)
                                                          = (12/3) . ((x + 3) / ((x - 3) . (x + 3))
                                                          = 4 / (x - 3)

6] ((1/( x + y)) - (2/(x - y))) : ((3/(x - y)) + (4/(x + y))
= ((x - y - 2x - 2y)/((x + y) (x - y))) : ((3x + 3y + 4x - 4y) / ((x + y) (x - y))
= ((-x - 3y)/((x + y) (x - y)) : ((7x - y)/((x + y) (x - y))
= ((-x - 3y/((x + y) (x - y)) . ((x + y) (x - y) / (7x - y))
= (-x - 3y) / (7x - y)