共50条信息
先化简,再求值:\((\dfrac{x^{2}{-}2x{+}4}{x{-}1}{+}2{-}x){÷}\dfrac{x^{2}{+}4x{+}4}{1{-}x}\),其中\(x\)满足\(x^{2}{-}4x{+}3{=}0\).
先化简,再求值:\(\dfrac{{{a}^{2}}-1}{{{a}^{2}}-2a+1}\div \dfrac{a+1}{a-1}-\dfrac{a}{a-1}\),其中\(a\)的值从不等式组\(\begin{cases} & 3-(a+1) > 0 \\ & 2a+2\geqslant 0 \end{cases}\),的整数解中选取.
下列分式中的\(x\)满足什么条件时,分式有意义\(?\)
\((2)\dfrac{{x}^{2}+3x+2}{\left(x+4\right)\left(x+1\right)} \).
化简\((1- \dfrac{1}{x})÷ \dfrac{{x}^{2}-2x+1}{x} .\)从\(0\),\(1\),\(2\)三个数中取一个\(x\)值,求出这个代数式的值.
先化简,再求值:\(\dfrac{{{x}^{2}}+2x+1}{2x-6}\div \left( x-\dfrac{1-3x}{x-3} \right)\),其中\(x\)为方程\(\left( x-6 \right)\left( x-3 \right)=0\)的实数根.
先化简再求值,\((\dfrac{x-1}{x+1}+\dfrac{2x}{{{x}^{2}}-1})\div \dfrac{1}{{{x}^{2}}-1}\),选择一个你喜欢的数代入求值.
先化简\(( \dfrac{3}{x+1}-x+1)÷ \dfrac{{x}^{2}-4x+4}{x+1} \),然后从\(-1\leqslant x\leqslant 2\)中选一个合适的整数作为\(x\)的值代入求值.
先化简\((\dfrac{x}{x+1}+\dfrac{x+1}{{{x}^{2}}-1})\div \dfrac{{{x}^{2}}+1}{{{x}^{2}}+x}\),再从\(-\sqrt{5}\leqslant x\leqslant \sqrt{5}\)中选择一个你喜欢的整数代入求值.
先化简:\(\left( 1-\dfrac{1}{a+2} \right)\div \dfrac{{{a}^{2}}-1}{a+2}\),并从\(-2\),\(-1\),\(1\),\(2\)中选一个合适的数作为\(a\)的值代入求值.
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