Jawapan

2016-07-19T16:48:56+08:00
9r²-4t²/6w²t ÷ 6r-4t/15t³= (3r)²-(2t)²/6w²t × 15t³/2(3r-2t)
                                    = (3r-2t)(3r+2t)/2w² × 5t²
                                    = 5t²(3r+2t)/4w²