y=x^3+〖(x-0.98)〗^2〖(x+1.25)〗^3 -5(x+1/x),x=2,x=4 时的值。
clear;syms x y;x=2;y=x^3+(x-0.98)^2/(x+1.25)^3-5*(x+1/x)
y =
-4.4697
cos60°-(9-√2)
cos(60*pi/180)-(9-2^0.5)^(1/3)
ans =
-1.4649
a=3,A=4,b=a^2,B=b^2-1,c=a+A-2B,C=a+B+2c
求：C
a=3,A=4,b=a^2,B=b^2-1,c=a+A-2*B,C=a+B+2*c
a =
3
A =
4
b =
9
B =
80
c =
-153
C =
-223
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