1元2次方程.用适当的方法解方程.(1) (3y - 1)² -25=0 (2) .x² - 4x= -2(3) 3x² - 13x +4 = 0 (4) 2t² - 4 = 7t(5) 3x² - 5x -2 = 0 (6) x² - 6x + 1 =0

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1元2次方程.用适当的方法解方程.(1) (3y - 1)² -25=0 (2) .x² - 4x= -2(3) 3x² - 13x +4 = 0 (4) 2t² - 4 = 7t(5) 3x² - 5x -2 = 0 (6) x² - 6x + 1 =0
1元2次方程.用适当的方法解方程.
(1) (3y - 1)² -25=0 (2) .x² - 4x= -2
(3) 3x² - 13x +4 = 0 (4) 2t² - 4 = 7t
(5) 3x² - 5x -2 = 0 (6) x² - 6x + 1 =0

1元2次方程.用适当的方法解方程.(1) (3y - 1)² -25=0 (2) .x² - 4x= -2(3) 3x² - 13x +4 = 0 (4) 2t² - 4 = 7t(5) 3x² - 5x -2 = 0 (6) x² - 6x + 1 =0
(1) (3y - 1)² -25=0
y²- 2*3y*1+1-25=0
y²- 6y-24=0
(3y - 4)(3y - 6)=0
3y - 4 =0
3y - 6=0