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?$x2-\frac {1}{2}x-\frac {3}{2}=0$?
?$\frac {3}{2}$?
?$\frac {1}{16}$?
?$\frac {1}{16}$?
?$\frac {1}{4}$?
?$±\frac {5}{4}$?
解?$：x2+2x=\frac {1}{4}$?
?$x2+2x+1=\frac {5}{4}$?
?$(x+1)2=\frac {5}{4}$?
?$x+1=±\frac {\sqrt{5}}{2}$?
?$x_1=-1+\frac {\sqrt{5}}{2}，x_2=-1-\frac {\sqrt{5}}{2}$

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解?$：x2+3x=\frac {1}{2}$?
?$x2+3x+\frac {9}{4}=\frac {11}{4}$?
?$(x+\frac {3}{2})2=\frac {11}{4}$?
?$x+\frac {3}{2}=±\frac {\sqrt{11}}{2}$?
?$x_1=\frac {\sqrt{11}-3}{2}，x_2=\frac {-\sqrt{11}-3}{2}$?
解?$：t2+\frac {5}{3}t=\frac {2}{3}$?
?$t2+\frac {5}{3}t+\frac {25}{36}=\frac {49}{36}$?
?$(t+\frac {5}{6})2=\frac {49}{36}$?
?$t+\frac {5}{6}=±\frac {7}{6}$?
?$t_1=\frac {1}{3}，t_2=-2$?
解?$：2y2-7y-2=0$?
?$y2-\frac {7}{2}y=1$?
?$y2-\frac {7}{2}y+\frac {49}{16}=\frac {65}{16}$?
?$(y-\frac {7}{4})2=\frac {65}{16}$?
?$y-\frac {7}{4}=±\frac {\sqrt{65}}{4}$?
?$y_1=\frac {\sqrt{65}+7}{4}，y_2=\frac {7-\sqrt{65}}{4}$

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