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.... ..(y+2)÷((y-2)(y+1))1.原式=3ab²×a/6b²=a²/22.解;原式=(y-1)/(y-2)²×(y-2)(y+2)

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(y+2)÷((y-2)(y+1))

1.原式=3ab²×a/6b²
=a²/2
2.解;原式=(y-1)/(y-2)²×(y-2)(y+2) /(y-1)(y+1)
=(y+2)/(y²-y-2)