(-4ab^2/3)*(3a^2/2+ab-0.6b^2)=-2a^3b^2-4a^2b^3/2+4ab^4/5
12ab[2a-3(a-b)/4+2b/3]=12ab[2a-3a/4+3b/4+2b/3]=12a^2b-9a^2b+9ab^2+8ab^2=3a^2b+17ab^2
(-a)^3*(-2ab^2)^3-4ab^2*(7a^5b^4-ab^3/2-5)=2a^6b^6-28a^6b^6+6a^2b^5+20ab^2
=-26a^6b^6+6a^2b^5+20ab^2
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