(-2/3x^2y^3)^3·(3xy)^2-(-1/2x^4y^3)^2·4/3y^4
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(-2/3x^2y^3)^3·(3xy)^2-(-1/2x^4y^3)^2·4/3y^4
还有一题2/3(x-y)^3·9/4(x-y)^5·7/15(y-x)^8
还有一题2/3(x-y)^3·9/4(x-y)^5·7/15(y-x)^8
(-2/3x^2y^3)^3·(3xy)^2-(-1/2x^4y^3)^2·4/3y^4
=-8/27x^6y^9·9x^2y^2-1/4x^8y^6·4/3y^4
=-8/3x^8y^11-1/3x^8y^10
2/3(x-y)^3·9/4(x-y)^5·7/15(y-x)^8
=2/3*9/4*7/15(x-y)^3*x-y)^5*(x-y)^8
=7/10(x-y)^16
=-8/27x^6y^9·9x^2y^2-1/4x^8y^6·4/3y^4
=-8/3x^8y^11-1/3x^8y^10
2/3(x-y)^3·9/4(x-y)^5·7/15(y-x)^8
=2/3*9/4*7/15(x-y)^3*x-y)^5*(x-y)^8
=7/10(x-y)^16
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