回答: #デルタ=±1# 説明: #ax ^ 2 + bx + c = 0# #Delta = sqrt(b ^ 2-4 * a * c) "判別式"# #x ^ 2-3x + 2 = 0# #a = 1 ";" b = -3 ";" c = 2# #Delta = sqrt(( - 3)^ 2-4 * 1 * 2)# #Delta = sqrt(9-8)# #Delta = sqrt 1# #デルタ=±1#