[질문] [어학/영어]2015년체크체크중3-1 10~18쪽답지점여

x제곱=49,x=7,-7 x제곱=0,x=0 x제곱=-81,x는없다/9,-9 3분의2,-3분의2 0.8,-0.8 4,-4 1,-1 없다 6,-6 5분의2,-5분의2 0.1,-0.1 0,없다,2분의3,-2분의3/0,플러스