望采纳
（1）原式=a²b^6 * (-b³ /a^6) * (-a^4/b^4)=(b^9/a^4)*(a^4/b^4)=b^5
（2）原式=-(a²b²/8)*(4b²/3a)*(9b^4/4a²)=-(ab^4/6)*(9b^4/4a²)=-9b^8/4
（3）原式=-x(x-y)*[xy/(x-y)²]*[(x-y)/x²]=-[x²y/(x-y)]*[(x-y)/x²]=-y
（4）原式=[x²(x-3)/(x-3)(x-2)]*[(x+3)(x-1)/x(x+3)(x-3)]*[(x-2)(x-6)/2x]
=[x²/(x-2)] * [(x-1)/x(x-3)] * [(x-2)(x-6)/2x]
=(x-1)(x-6)/2(x-3)
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