x=0:10; y=2*x^2+3*x+1; plot(x,y) 提示y=2*x^2+3*x+1;这一行有错误

x=0:0.01:100; y=2^x.; plot(x,y) 为什么出错? 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y mathematica,可以画出 Plot[n,{x,0,2Pi}] 但是 画不出 y=D[n,x] Plot[y,x] x=-20:0.01:20; y=x.*x+2; plot(x,y( :,20))后面的（x,y( :, matlab画图x = 0:0.01:10; y =sin(2*x)*cos(100*x)/(2*x); plot(x, matlab中写入代码：x=0:0.1:1; y=(1+2*x)^(1/2) ; plot(x,y) matlab中如何画图!看看x=-10:0.1:10; y=exp(-(x.- 1)^2);plot(x,y)是怎么回事 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 函数,y=3x/(x^2+x+1) ,x 函数y=3x/(x^2+x+1) （x matlab x=0:6:15; y=10*(x^2+1).^(-3/2).*[1-3/(x^2+1)]; plot(y