1.[(-3xy)^2*x^3-2x^2*(3xy^2)^3*1/2y]除以9x^4y^2=
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1.[(-3xy)^2*x^3-2x^2*(3xy^2)^3*1/2y]除以9x^4y^2=
2.若a(x^3m)y^12/(3(x^2)y^2n)=4x^6y^8求2m+n-a
2.若a(x^3m)y^12/(3(x^2)y^2n)=4x^6y^8求2m+n-a
1.[(-3xy)^2*x^3-2x^2*(3xy^2)^3*1/2y]除以9x^4y^2
=(9x^5y^2-27x^5y^5)/9x^4y^2
=x-3xy^3
2.
a(x^3m)y^12/(3(x^2)y^2n)
=a/3*x^(3m-2)y^(12-2n)=4x^6y^8
所以,a/3=4,a=12
3m-2=6,m=8/3
12-2n=8,n=2
2m+n-a=2*8/3+2*2-12=28/3-12=4/3
=(9x^5y^2-27x^5y^5)/9x^4y^2
=x-3xy^3
2.
a(x^3m)y^12/(3(x^2)y^2n)
=a/3*x^(3m-2)y^(12-2n)=4x^6y^8
所以,a/3=4,a=12
3m-2=6,m=8/3
12-2n=8,n=2
2m+n-a=2*8/3+2*2-12=28/3-12=4/3
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