Recent content by caocuong93

Double-posted, sorry! I don't know how to delete doubled posts:confused:.

Hi. I'm just a newbie but would like to give it a try. Look for any mistakes :approve:! This is what I got after a while working it out: \left[{\frac{a^{-2}b^{-3}}{2a^3b^{-4}}\right]^2*~\frac{a^{-3}b^2}{ab^{-15}} =...