共50条信息
计算
\((1) \dfrac{3{a}^{2}}{4b}· \dfrac{16b}{9a} \) \((2)\) \(8{x}^{2}{y}^{3}·(-3x{y}^{2})÷6xy \)
\((3)2y(x+y) + (x+y)(x-2y)\) \((4) (x+1)^{2} –(2x– 5)(2x+5)\)
化简
\((1)2x+(5x-3y)-(3x+y)\)
\((2)3(4x^{2}-3x+2)-2(1-4x^{2}-x)\)
先化简,再求值:\(2x^{2}+3({-}x^{2}+3xy-y^{2}){-}({-}x^{2}{-}2y^{2})\),其中\(x= \dfrac{1}{2} \),\(y=-2\).
先化简,再求值:
\( \dfrac{1}{2}x-(2x- \dfrac{2}{3}{y}^{2}+3xy)+( \dfrac{3}{2}x-{x}^{2}+ \dfrac{1}{3}{y}^{2})+2xy \),其中\(x=-2\),\(y= \dfrac{1}{2} \).
进入组卷