Question

поможіть!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$\displaystyle\bf\\2aa^{2}+5b\cdot 2b -7a^{2} a^{3} =2a^{1+2} +10b^{1+1} -7a^{2+3} =\\\\=\boxed{2a^{3} +10b^{2} -7a^{5} }$