(1/3a^2b^3)(-15a^2b^2)

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(1/3a^2b^3)(-15a^2b^2)(1/3a^2b^3)(-15a^2b^2)(1/3a^2b^3)(-15a^2b^2)(1/3a^2b^3)(-15a^2b^2)=-5a^4b^5

(1/3a^2b^3)(-15a^2b^2)
(1/3a^2b^3)(-15a^2b^2)

(1/3a^2b^3)(-15a^2b^2)
(1/3a^2b^3)(-15a^2b^2)
=-5a^4b^5