y-3/4y-8÷(5/y-2 -y-2) 一道数学题,

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y-3/4y-8÷(5/y-2-y-2)一道数学题,y-3/4y-8÷(5/y-2-y-2)一道数学题,y-3/4y-8÷(5/y-2-y-2)一道数学题,(y-3)/(4y-8)÷[5/(y-2)-

y-3/4y-8÷(5/y-2 -y-2) 一道数学题,
y-3/4y-8÷(5/y-2 -y-2) 一道数学题,

y-3/4y-8÷(5/y-2 -y-2) 一道数学题,
(y-3)/(4y-8)÷[5/(y-2) -(y+2)]
=(y-3)/(4y-8)÷[5-y^2+4]/(y-2).
=-(y-3)/(4y-8)*(y-2)/(y^2-9)
=-[(y-3)/4]/[(y-3)(y+3)]
=-1/[4(y+3)].

y-3/4y-8÷(5/y-2 -y-2)
=y-3/4y-8 * (y-2)/(9-y^2)
=(y-3)/4 *1/(3+y)(3-y)
=-1/4(3+y)