[질문] 개념원리중학수학9-가63쪽답좀알려주세요

-2x(x-4)/xy(x-y)/(x+5)(y-3)/-(x-1)/(3a+5)(3a-5)/(4a+9y)(4a-9y)/(-2(x+7)(x-7)/(x+5)(x-3)/입니다^^