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,\((\dfrac{x-1}{x+1}+\dfrac{2x}{{{x}^{2}}-1})\div \dfrac{1}{{{x}^{2}}-1}\),选择一个你喜欢的数代入求值.
先化简\((\dfrac{x}{x+1}+\dfrac{x+1}{{{x}^{2}}-1})\div \dfrac{{{x}^{2}}+1}{{{x}^{2}}+x}\),再从\(-\sqrt{5}\leqslant x\leqslant \sqrt{5}\)中选择一个你喜欢的整数代入求值.
约分:
\((1) \dfrac{3{a}^{2}b}{6a{b}^{2}c} .\)
\((2) \dfrac{2{\left(x-y\right)}^{3}}{y-x} .\)
\((3) \dfrac{x{y}^{2}+2y}{{y}^{2}} .\)
\((4) \dfrac{{a}^{2}+2a+1}{{a}^{2}-1} \).
先将分式\((1+\dfrac{3}{x-1})\div \dfrac{x+2}{{{x}^{2}}-1}\)化简,再选择使原式有意义而你又喜欢的数代入求值.
先将分式\((1+\dfrac{3}{x-1})\div \dfrac{x+2}{{{x}^{2}}-1}\)化简,再选择一个你非常喜欢的数代入求值。
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