分类：教育/科学-学习帮助
问题：计算下列各题（1）（3m^2n)^3·(
（1）（3m^2n)^3·(-2mn^2)^2
 (2)  (-a^2)^3+3a^4·a^2-(-5a^3)^2
 (3)  0.4x^2y·(1/2xy)^2-(-2x)^3·xy^3
 (4) (-1/2xy^2)^3+1/4x^3(y^3)^2
 (5) -p·(-p)^4
回答：（1）（3m^2n)^3·(-2mn^2)^2
=(27m^6n^3)(4m^2n^4
=108m^8n^7 
(2) (-a^2)^3+3a^4·a^2-(-5a^3)^2 
=-a^6+3a^6-25a^6
=-23a^6
(3) 0.4x^2y·(1/2xy)^2-(-2x)^3·xy^3 
=0.4x^2y*(1/4)x^2y^2-(-8x^3)*xy^3
=0.1x^4y^3+8x^4y^3
=8.1x^4y^3
(4) (-1/2xy^2)^3+1/4x^3(y^3)^2 
=(-1/8)x^3y^6+(1/4)x^3y^6
=(1/8)x^3y^6
(5) -p·(-p)^4
=-p*p^4
=-p^5