Question

对于任意非零自然数x、y,规定符号“√”表示一个运算,且x√y={[x*x-x*(x-1)]+y*y*y-5.2}*2-

Answer 1

{[x*x-x*(x-1)]+y*y*y-5.2}*2-1

={[5*5-5*(5-1)]+5*5*5-5.2}*2-1

=(5+125-5.2)*2-1

=259.8-1

=258.8