A.diff函数求解B.int函数求解C.solve函数求解D.dsolve函数求解
A.sym a b;B.syms a b;C.sym(’a’.’b’);D.syms(a.b);
A.p=polyfit(x.y,n)B.p=polyval(x.y,1)C.polyval(x.y,1)D.p=polyfit(x.y,1)