MATLAB:Error using ==> inlineeval fplot('[ (1/((sqrt(2*pi))*1))*(exp(-(x.^2)/(2*1^2))),(1/((sqrt(2*pi))*2))*（exp(-(x.^2)/(2*2^2))),(1/((sqrt(2*pi))*4))*（exp(-(x.^2)/(2*4^2))),(1/((sqrt(2*pi))*（220/100）))*（exp(-(x.^2)/(2*（220/100）^2))) ]

MATLAB:Error using ==> inlineeval fplot('[ (1/((sqrt(2*pi))*1))*(exp(-(x.^2)/(2*1^2))),(1/((sqrt(2*pi))*2))*（exp(-(x.^2)/(2*2^2))),(1/((sqrt(2*pi))*4))*（exp(-(x.^2)/(2*4^2))),(1/((sqrt(2*pi))*（220/100）))*（exp(-(x.^2)/(2*（220/100）^2))) ]
MATLAB:Error using ==> inlineeval
fplot('[ (1/((sqrt(2*pi))*1))*(exp(-(x.^2)/(2*1^2))),(1/((sqrt(2*pi))*2))*（exp(-(x.^2)/(2*2^2))),(1/((sqrt(2*pi))*4))*（exp(-(x.^2)/(2*4^2))),(1/((sqrt(2*pi))*（220/100）))*（exp(-(x.^2)/(2*（220/100）^2))) ]',[-10,10])

MATLAB:Error using ==> inlineeval fplot('[ (1/((sqrt(2*pi))*1))*(exp(-(x.^2)/(2*1^2))),(1/((sqrt(2*pi))*2))*（exp(-(x.^2)/(2*2^2))),(1/((sqrt(2*pi))*4))*（exp(-(x.^2)/(2*4^2))),(1/((sqrt(2*pi))*（220/100）))*（exp(-(x.^2)/(2*（220/100）^2))) ]
将代码中的括弧、逗号换为半角的就可以了：
[(1/((sqrt(2*pi))*1))*(exp(-(x.^2)/(2*1^2))),(1/((sqrt(2*pi))*2))*(exp(-(x.^2)/(2*2^2))),(1/((sqrt(2*pi))*4))*(exp(-(x.^2)/(2*4^2))),(1/((sqrt(2*pi))*(220/100)))*(exp(-(x.^2)/(2*(220/100)^2)))]