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\(x= \dfrac{1}{2} \)，\(y=-2\)．
\((１)7x-\)\( \dfrac{1}{2}\left[x- \dfrac{1}{2}\left(x-1\right)\right]= \dfrac{2}{3}\left(x-1\right) \)
\((2)\) \(\dfrac{x-3}{0.5}-\dfrac{x+4}{0.2}=1.6\)
\((3)\dfrac{1}{2}\{\dfrac{1}{3}[\dfrac{1}{4}(\dfrac{1}{5}x-1)-6]+4\}=1\)
计算：
\((2) 2x-1=3x+2\)
\((4)3(ab-5b^{2}+2a^{2})-(7ab+16a^{2}-25b^{2}).\)
进入组卷