1、a的平方乘以a的四次方+2a乘以a的五次方-（2a的立方）的平方

1.a^2*a^4+2a*a^5-(2a^3)^2=a^6+2a^6-2a^6=a^62.(2x^3*x^5)+(-x)^2*(x^2)^3*(-x^2)^4=2x^8+x^2*x^6*x^8=2x^8+x^163.3(x-y)^2-5(y-x)+4(y-x)^2-3(x-y)-6(x-y)^2=(3+4-6)(x-y)^2+(5-3)(x-y)=(x-y)^2+2(x-y)=(x-y)(x-y+...