matlab 开方运算 画图clc;x=0:0.1:15;y=sqrt(x*x-4*x+20)+sqrt(x*x+9);figureplot(x,y);报错为Error using ==> mtimesInner matrix dimensions must agree.Error in ==> suanshu at 3y=sqrt(x*x-4*x+20)+sqrt(x*x+9);figure

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