原式=-8a^3b^6[(-a^2b^n)^15(a^(n-1)b^2)^15
=-8a^3b^6*(-a^30)b^15n*a^15(n-1)b^30
=8a^(3-30+15n-15)b^(6+15+30)
=8a^(15n-42)b^51还有一题：[(-a²b的n次方）³·(a的n-1次方·b²)³]的5次方；=[(-a^2b^n)^15(a^(n-1)b^2)^15=(-a^30)b^15n*a^15(n-1)b^30=-a^(30+15n-15)b^(15n+30)=-a^(15n+15)b^(15n+30)