Question

设矩阵M=［a 0］ （其中a>0,b>0）若曲线C：

Answer 1

经变换后

[a 0 [x [ax 0 b] y] = by]

所以变换后为 x' = ax,y' = by,x = x'/a,y=y' / b,

变换后曲线 (x'/a)^2 + (y'/b)^2 = 1

a = 2 b = 1 a+b=3