求多项式中变量的最高次幂系数应输入
A.poly=(x^2*y+2y)^3+5x^6*y^2+2x^2 Coefficient[poly,x^[Exponent[poly,x]]]
B.poly=(x^2*y+2y)^3+5x^6*y^2+2x^2 Coefficient[poly,x^(Exponent[poly,x])]
C.poly=(x^2y+2y)^3+5x^6y^2+2x^2 Coefficient[poly,x^[Exponent[poly,x]]]
D.poly=(x^2*y+2y)^3+5x^6*y^2+2x^2 Exponent[poly,x]; Coefficient[poly,%]