Question 202012_上海中考20.(本题满 分10分)解方程: ${ \frac { x } { x + 3 } } + { \frac { 6 } { x ^ { 2 } - 9 } } = { \frac { 1 } { x - 3 } }$查看答案解析答案$x = 1$
Question 32012_上海中考3.不等式组$\begin{cases}-2x<6\\x-2>0\end{cases}$的解集是( )A$x>-3$B$x<-3$C$x>2$D$x<2$查看答案解析答案CExplanation【答案】C
Question 42012_上海中考4.在下列各式中,二次根式$\sqrt{a-b}$的有理化因式( )A$\sqrt{a+b}$B$\sqrt{a}+\sqrt{b}$C$\sqrt{a-b}$D$\sqrt{a}-\sqrt{b}$查看答案解析答案CExplanation【答案】C