将直线2x-y+3=0绕着它上面的点(-1,1)沿着逆时针方向旋转45°所得直线方程为A.2x+y+1=0 B.3x+y+2=0 C.x+2y-1=0 D.x+3y-2=0
问题描述:
将直线2x-y+3=0绕着它上面的点(-1,1)沿着逆时针方向旋转45°所得直线方程为
A.2x+y+1=0 B.3x+y+2=0 C.x+2y-1=0 D.x+3y-2=0
答
B画图作罢,挺容易看出~~
答
B