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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