已知根号(2X-Y)的平方=3,三次根号(X-2Y)的立方= --3,求(X+2Y)(X-Y)的值.(有2种答案)
问题描述:
已知根号(2X-Y)的平方=3,三次根号(X-2Y)的立方= --3,求(X+2Y)(X-Y)的值.(有2种答案)
答
X=3,Y=3,(X+2Y)(X-Y)=0 或者X=-1,Y=1,(X+2Y)(X-Y)=-2
已知根号(2X-Y)的平方=3,三次根号(X-2Y)的立方= --3,求(X+2Y)(X-Y)的值.(有2种答案)
X=3,Y=3,(X+2Y)(X-Y)=0 或者X=-1,Y=1,(X+2Y)(X-Y)=-2