用于替换函数f中变量x，求值的MATLAB函数命令是
A. sub(f)
B. sub(f,x)
C. subs(f,x)
D. subs(f)
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下列关于matlab函数命令compose(f,g,t)的说法正确的是
A. 命令返回复合函数g(f(x))
B. 命令返回复合函数g(f(t))
C. 命令返回复合函数f(g(t))
D. 命令返回复合函数f(g(x))
命令solve('3*x^2+x+1')的含义是
A. 求解方程3*x^2+x=1
B. 求解方程3*x^2+x=-1
C. 求解方程3*x^2+x-1=0
D. 求解方程3*x^2+x+1=0
He isn't_______ to go to school.
A. old enough
B. enough old
C. big enough
D. enough big
As we know, a red jacket doesn't ________ green trousers. But when a little girl wears them, they ____ her very well.
A. fit, suit
B. suit, fit
C. match, suit
D. fit, match
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