Question

найдите значение выражения 6a²-2a-1 при a =-1 дробь 4

Answer 1

6*(-1/4)²-2*(-1/4)-1 =

=6*(1/4)^2+(1/2)-1=

=6*(1/16)+(1/2)-1=

=3*(1/8)+(1/2)-1=

=(3/8)+(1/2)-1=

=(3+4-8)/8=

=-1/8=-0.125