China Science Citation Database (CSCD). Founded in 1989, it contains more than 1,000 Chinese and English scientific and technological core journals and excellent journals published in the fields of mathematics, physics, chemistry, astronomy, geoscience, biology, agriculture and forestry, medicine and health, engineering technology and environmental science. From 1989 to now, there are 48 papers18977 and 60854096 citations.
Then the two roots of the equation AX 2+BX+C = 0 are x 1, X 2, and its judgment formula is K.
x 1=(-b+k^0.5)/(2a),x2=(-b-k^0.5)/(2a)£¬
There must