a:b:c=1:2√2:2
则方程化为:x^2+2√2x+2=0
即:(x+√2)^2=0
得:x=-√2
b是2a,2c的比例中项,则:b^2=2a*2c=4ac
则delta=b^2-4ac=0,方程为等:x=-b/(2a)=-2c/b,即为此比例的相反数.
a:b:c=1:2√2:2
则方程化为:x^2+2√2x+2=0
即:(x+√2)^2=0
得:x=-√2
b是2a,2c的比例中项,则:b^2=2a*2c=4ac
则delta=b^2-4ac=0,方程为等:x=-b/(2a)=-2c/b,即为此比例的相反数.