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信息發(fā)布者：

$x(x + 2)=224$

$39.75(1 + x)^{2}=44.50$

$x^{2}+(x + 7)^{2}=13^{2}$

$x\times1=(1 - x)^{2}$

解：?$x^2=100$?

?$ x = \pm \sqrt {100}$?

?$ x_{1}=10，$??$x_{2}=-10$?

解：?$9x^2=1$?

?$x^2=\frac {1}{9}$?

?$ x=\pm \frac {1}{3}$?

?$x_{1}=\frac {1}{3}，$??$x_{2}=-\frac {1}{3}$?

解：?$2x^2-32 = 0$?

?$ x^2=16$?

?$ x = \pm \sqrt {16}$?

?$ x_{1}=4，$??$x_{2}=-4$?

解：?$9y^2-1 = 3$?

?$ y^2=\frac {4}{9}$?

?$ y = \pm \sqrt {\frac {4}{9}}$?

?$y_{1}=\frac {2}{3}，$??$y_{2}=-\frac {2}{3}$?

解：?$(x + 1)(x - 1)=8$?

?$ x^2-1 = 8$?

?$ x^2=9$?

?$ x = \pm \sqrt {9}$?

?$ x_{1}=3，$??$x_{2}=-3$?

解：?$4x(x - 2)=1 - 8x$?

?$ 4x^2-8x = 1 - 8x$?

?$ 4x^2=1$?

?$ x^2=\frac {1}{4}$?

?$ x = \pm \sqrt {\frac {1}{4}}$?

?$x_{1}=\frac {1}{2}，$??$x_{2}=-\frac {1}{2}$?