第2页 - 通城学典课时作业本九年级数学人教版南通专版

$ ±\sqrt {p}$

$ \frac {-n±\sqrt {p}}{m}$

$ mx+n=± \sqrt{p}\ $

B

$ x_{1} =3,x_{2}=−3$

$x_{1}=3,x_{2}=−7$

$ 解:x^{2}=4$

$x_{1}=2,x_{2}=-2$

$解:x^{2}=\frac {5}{4}$

$x_{1}=\frac{\sqrt{5}}{2},x_{2}= −\frac{\sqrt{5}}{2}$

$解:x^{2}=\frac {7}{16}$

$x_{1}=\frac{\sqrt{7}}{4},x_{2}=−\frac{\sqrt{7}}{4}$

$解:(x-3)^{2}=9$

$\ \ \ \ \ x-3=±3$

$x_{1}=0,x_{2}=6$

$解: x+3=±2$

$x_{1}=−3+\sqrt{2},x_{2}=−3− \sqrt{2}$

$解:(x-1)^{2}=6$

$ x-1=±\sqrt {6}$

$x_{1}=1+\sqrt{6},x_{2}=1−\sqrt{6}$