Question

解方程和算式X^2+X+1/(X^2+X)=2还有算式:根号1.5*根号(8/3)+(根号2-2)^-1－(-1/3)^

Answer 1

X^2+X+1/(X^2+X)=2

令x^2+x=a

a+1/a=2

a^2-2a+1=0

a=1

x^2+x-1=0

x=[-1+/-根号5]/2

根号1.5*根号(8/3)+(根号2-2)^-1－(-1/3)^0

=根号(3/2)根号(8/3)+(2+根号2)/(-2)-1

=2-1-根号2/2-1

=-根号2/2

X^2/(X+2Y)-X+2Y-2

=(我还不懂,你教我)