数学(4y-36)/y等于多少?y-9/y=x/4x

Question

数学(4y-36)/y等于多少?
y-9/y=x/4x

Answer 1

因为y-9/y=x/4x,所以(y^2-9)/y=1/4;
则4y^2-36=y,即4y^2-y-36=0,
所以,(y+3)(4y-12)=0,
故y=-3.
代入原式,得(4y-36)/y=[4x（-3）-36]/(-3)
=(-48)/(-3)
=16.