下面这3道计算题答案.-3a^2b*(a^3*-5a^2*b^3)=?(6x^4*y^3-15x^3*y^3)/(-3xy^2)=?(2x-5)^2-(2x+3)(2x-3)=?

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下面这3道计算题答案.-3a^2b*(a^3*-5a^2*b^3)=?(6x^4*y^3-15x^3*y^3)/(-3xy^2)=?(2x-5)^2-(2x+3)(2x-3)=?
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下面这3道计算题答案.-3a^2b*(a^3*-5a^2*b^3)=?(6x^4*y^3-15x^3*y^3)/(-3xy^2)=?(2x-5)^2-(2x+3)(2x-3)=?
下面这3道计算题答案.
-3a^2b*(a^3*-5a^2*b^3)=?
(6x^4*y^3-15x^3*y^3)/(-3xy^2)=?
(2x-5)^2-(2x+3)(2x-3)=?

下面这3道计算题答案.-3a^2b*(a^3*-5a^2*b^3)=?(6x^4*y^3-15x^3*y^3)/(-3xy^2)=?(2x-5)^2-(2x+3)(2x-3)=?
-3a^2b*(a^3*-5a^2*b^3)=-3a^5b+15a^4b^4
(6x^4*y^3-15x^3*y^3)/(-3xy^2)=-18x^5y^5+45x^4y^5
(2x-5)^2-(2x+3)(2x-3)=-20x+36