y3-y2-y+1/y2-1 × x2-1/x3-x2-x+1 × x-1/y-1化简
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y3-y2-y+1/y2-1×x2-1/x3-x2-x+1×x-1/y-1化简y3-y2-y+1/y2-1×x2-1/x3-x2-x+1×x-1/y-1化简y3-y2-y+1/y2-1×x2-1/x3
y3-y2-y+1/y2-1 × x2-1/x3-x2-x+1 × x-1/y-1化简
y3-y2-y+1/y2-1 × x2-1/x3-x2-x+1 × x-1/y-1
化简
y3-y2-y+1/y2-1 × x2-1/x3-x2-x+1 × x-1/y-1化简
拜托加上括号好不好?
(y³-y²-y+1)/(y²-1) × (x²-1)/(x³-x²-x+1) × (x-1)/(y-1)
=[y(y²-1)-(y²-1)]/(y²-1)× (x²-1)/[x(x²-1)-(x²-1)]× (x-1)/(y-1)
=(y-1)× [1/(x-1)]× (x-1)/(y-1)
=1
题目表达模糊
y3-y2-y+1/y2-1 × x2-1/x3-x2-x+1 × x-1/y-1化简
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