1.(-xy)^5÷(-xy)^3 2.(-a^3)^5÷[(-a^2)·(-a^3)^2] 3.(x^6÷x^2)^2+x^9÷x^3·x^2

问题描述:

1.(-xy)^5÷(-xy)^3 2.(-a^3)^5÷[(-a^2)·(-a^3)^2] 3.(x^6÷x^2)^2+x^9÷x^3·x^2
1.(-xy)^5÷(-xy)^3
2.(-a^3)^5÷[(-a^2)·(-a^3)^2]
3.(x^6÷x^2)^2+x^9÷x^3·x^2

(-xy)^5÷(-xy)^3
=(xy)^(5-3)
=(xy)^2
 
2.(-a^3)^5÷[(-a^2)·(-a^3)^2]
=(-a)^(3x5)÷[(-a^2)·(a^6) ]
=(-a)^15÷[(-a)^(2+6) ]
=(-a)^15÷[(-a)^8 ]
=a^(15-8)
=a^7
 
3.(x^6÷x^2)^2+x^9÷x^3·x^2
=[x^(6-2)]^2+x^(9-3+2)
=[x^(4x2)]+x^8
=x^8+x^8
=2x^8