Question

СРОЧНО,ДАЮ 30 БАЛЛОВ

Answer 1

$1)\; \; 11ab(12a^2-b^2)+12ab(b^2-11a^2)=\\\\=132a^3b-11ab^3+12ab^3-132a^3b=ab^3=10\cdot (-5)^3=\\\\=-10\cdot 125=-1250\\\\2)\; \; -5t^2(2t^4-3k)+5(4t^6-2k)=-10t^6+15t^2k+20t^6-10k=\\\\=10t^6+15t^2k-10k\\\\3)\; \; 0,9(4a+3b)-6(0,4a+0,9b)=3,6a+2,7b-2,4a-5,4b=\\\\=1,2a-2,7b=1,2\cdot 2-2,7\cdot (-4)=2,4+10,8=13,2$