如题所述
=(y-3)/2(y-2)÷((y^2-9)/(y-2))
=(y-3)(y-2)/(2(y-2)(y+3)(y-3))
=1/2(y+3)追答
=(y-3)(y-2)/(2(y-2)(y+3)(y-3))
=1/2(y+3)追答
=(y-3)/4(y-2)÷((y^2-9)/(y-2))
=(y-3)(y-2)/(4(y-2)(y+3)(y-3))
=1/4(y+3)
除以一个分数,等于乘以它的倒数。
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