[질문] 비상 9-가개념플러스유형파워 중 개념편74페이지답좀요꼭요ㅜㅜ

1.(1)xy(x+3y)제곱,(2)(3x-2y+3)(3x-2y-5),(3)(x+3y)제곱,(4)(x+y+1)(x+y-3)/2.(1)(a+1)(a-b),(2)(x+z)(y+z),(3)(a+b)(a-4),(4)(x-1)(y+1)/3.(1)(x+y+1)(x+y-1)