a的平方乘以a的五次方减2a的立方乘以a的四次方
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1.a^2*a^4+2a*a^5-(2a^3)^2=a^6+2a^6-2a^6=a^6
2.(2x^3*x^5)+(-x)^2*(x^2)^3*(-x^2)^4=2x^8+x^2*x^6*x^8=2x^8+x^16
3.3(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+2)
4.
A+B=2a^3+2a^3-a-2
A-C=2a^3-a-4a^2+1
|a|=3B+C=2a^3+4a^2-3=2×9a+4×9-3=18a+33=87或-21
2.(2x^3*x^5)+(-x)^2*(x^2)^3*(-x^2)^4=2x^8+x^2*x^6*x^8=2x^8+x^16
3.3(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+2)
4.
A+B=2a^3+2a^3-a-2
A-C=2a^3-a-4a^2+1
|a|=3B+C=2a^3+4a^2-3=2×9a+4×9-3=18a+33=87或-21
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