( - 3 x/5 x y^2 ) ·( - 5 y^2/12 x y ) sood he ma - Dicamon

Question

( - 3 x/5 x y^2 ) ·( - 5 y^2/12 x y ) sood he ma cac 7)  1/3 x - 2 - 1/3 x + 2 - 3 x - 6/4 - 9 x^2 8)  1/x + 1/x + 5 + x - 5/x^2 + 5 x 9)  . [ 4 x^2 - 1/x ± 1

Answer

8) . [ 1/3 x - 2 - 1/3 x + 2 - 3 x - 6/4 - 9 x^2 ] , [ = 3 x + 2/( 3 x - 2 x ( 3 x + 2  )  ) - 3 x - 2/( 3 x - 2  ) ( 3 x + 2  ) + 3 x - 6/( 3 x - 2  ) ( 3 x + 2  ) , [ = 3 x + 2

giúp mình câu 8,9 với ạ