共50条信息
化简\( \dfrac{x^{2}-1}{x^{2}+2x}÷ \dfrac{x+1}{x}\).
计算:\({{(\dfrac{-a}{b})}^{2}}\div {{\left( \dfrac{2{{a}^{2}}}{5b} \right)}^{2}}\bullet \dfrac{a}{5b}\)
进入组卷