Question

упростите выражение 3а^2-2а-(а-1)^2 при а=0.5

Answer 1

3a²-2a-(a-1)² = 3a²-2a-(a²-2a+1) = 3a²-2a-a²+2a-1 = 2a²-1 = 2*0.5²-1 =       2*0.25-1 = 0.50-1 = 0.5-1 = -0.5.