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The first volume score of the second day of junior high school mathematics
x^2-xy+3y^2/x^2+xy+6y^2

=(x^2-xy+3y^2)/(x^2+xy+6y^2)

=(y^2)(x^2/y^2-xy/y^2+3)/[(y^2)(x^2/y^2+xy/y^2+6)]

=(4-2+3)/(4+2+6)

=(5)/( 12)

=5/ 12

Known: x/(x 2+x+1) = a, (x 2+x+1)/x =1/a, x+ 1+x = 65438. =( 1/a- 1)?

x? +2+ 1/x? =( 1/a- 1)? ,x? + 1/x? + 1=( 1/a- 1)? - 1,(x^4+x^2+ 1)/x? =( 1/a)( 1/a-2)

∴x? /(x^4+x^2+ 1)= 1/[ 1/a( 1/a-2)]

x^2/x^4+x^2+ 1

=x^2/(x^4+x^2+ 1)

= 1/[ 1/a( 1/a-2)]