б) 3ab^2*4a^3b+7a^3b*2(-a)b-12a^3b^3*3/4a^2b=12a^4b^3-14a^4b^2-9a^5b^4=-9a^5b^4+12a^4b^3-14a^4b^2
в) 16aaa^2*(-3/2)a^2b+12ab*5/4a^2b^3=-24a^6b+15a^3b^4
г) 7a^4+12a^3b+3a^2b^2-7ab^3+5a^4-9a^3b-3a^2b^2-ab^3=12a^4+3a^3b-8ab^3
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б) 3ab^2*4a^3b+7a^3b*2(-a)b-12a^3b^3*3/4a^2b=12a^4b^3-14a^4b^2-9a^5b^4=-9a^5b^4+12a^4b^3-14a^4b^2
в) 16aaa^2*(-3/2)a^2b+12ab*5/4a^2b^3=-24a^6b+15a^3b^4
г) 7a^4+12a^3b+3a^2b^2-7ab^3+5a^4-9a^3b-3a^2b^2-ab^3=12a^4+3a^3b-8ab^3