(2)4x？ -8 1=0, quadratic coefficient is 4, linear coefficient is 0, and constant term is -8 1. (3)4x？ +8x-25=0, quadratic coefficient is 4, linear coefficient is 8, and constant term is -25. (4)3x？ -7x+ 1=0, quadratic coefficient is 3, linear coefficient is -7, and constant term is 1.

2. Solution: (1)4x? =25，4x？ -25=0.

(2)x(x-2)= 100，x？ -2x- 100=0。

(3)x？ 1=( 1-x)？ -3x+ 1=0。