共50条信息
化简求值\(x(x+2y)-(x+1)^{2}+2x\),其中\(|x+\dfrac{1}{2}|+{{(y-2)}^{2}}=0\).
已知\(4a^{2}-4ab+2b^{2}-4b+4=0\),试求\(\dfrac{1}{ab}+\dfrac{1}{(a+1)(b+1)}+\dfrac{1}{(a+2)(b+2)}+\cdots +\dfrac{1}{(a+2009)(b+2009)}\)的值
已知:\({x}^{2}+{y}^{2}-4x+6y+13=0 \),先化简,再求:\(\left(2x-y+1\right)\left(2x-y-1\right)\left(2x+y\right)\left(2x-y\right) \)的值
\((1)\)计算:\((– \sqrt[]{3})^{0}–\left| –3 \right|+ (–1)^{2016}+ ( \dfrac{1}{2})^{–1}\)
\((2)\)解不等式组:\(\begin{cases}x-1 > 2 \\ x+2 < 4x-1\end{cases} \).
已知\(m\),\(n\)满足关系式\(9{m}^{2}+{n}^{2}-6m-4n+5=0 \),请你将\(\left( \dfrac{2}{3}m \sqrt{9m}+{n}^{2} \sqrt{ \dfrac{m}{{n}^{3}}}\right)-\left({m}^{2} \sqrt{ \dfrac{1}{m}}-5m \sqrt{ \dfrac{n}{m}}\right) \)化简,并求出它的值。
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