Question

Упрости выражение −7t3(2t7−3k)+5(4t10−3k).

Answer 1

$\tt~-7t^3*(2t^7-3k)+5*(4t^{10} -3k)=-14t^{10} +21t^3k+20t^{10} -15k=\boxed{\bf6t^{10} +21t^3k-15k} .$