The eighth grade mathematics exercise book of Zhejiang Education Publishing House 2. 1 section The answer to a quadratic equation.
( 1)D
3x？ -5x+ 1=0 3 -5 1
x？ +x-8=0 1 1 -8
-7x？ +4=0 -7 0 4
-1 Yes 1 No.
-2 No. -Four-thirds.
-x？ +0.5x-0.06=0
x= 1
a+b= 1/3 x=- 1