先分解已知:
9x^2 + 16y^2 =24xy
9x^2 + 16y^2-24xy =0
(3x-4y)^=0
3x-4y=0
x=4y/3
再看求值式:
(2x^2+xy+5Y^2)/(x^2-xy+2y^2)
=(32/9+4/3+5)y^2/(16/9-4/3+2)y^2
=9/2
先分解已知:
9x^2 + 16y^2 =24xy
9x^2 + 16y^2-24xy =0
(3x-4y)^=0
3x-4y=0
x=4y/3
再看求值式:
(2x^2+xy+5Y^2)/(x^2-xy+2y^2)
=(32/9+4/3+5)y^2/(16/9-4/3+2)y^2
=9/2