共50条信息
先化简,再求值:\({{(2x-1)}^{2}}-2(x-1)(x+1)-x(x-2)\),其中\({{x}^{2}}-2x-3=0\).
先化简,再求值:\(2{{x}^{3}}{{y}^{2}}-(7{{x}^{2}}{{y}^{3}}-2x)-2({{x}^{3}}{{y}^{2}}-3{{x}^{2}}{{y}^{3}}+x)\),其中\(x=-1\).\(y=-\dfrac{1}{2}\)
计算:
\((2)(\)\(x\)\(—1)^{2}—(\)\(x\)\(+1)(\)\(x\)\(—3)\).
计算:\((1)(-1)^{2}×(-4)+(-1)^{2017}\)
\((2)(4a^{2}b-5ab^{2})-(3a^{2}b-4ab^{2})\)
\((1)5x-4y-3x+y\); \((2)(2a^{2}-4a+1)-(-3a^{2}+2a-5)\).
化简:
\((1)\) \(6ab(2a^{2}b-\)\( \dfrac{1}{3} \) \(ab^{2}).(2)(x+7)(x-6)-(x-2)(x+1)\)
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\(x=-2\),\(y= \dfrac{1}{2} \).
化简\((\)或求值\()\)
\((2)4(x^{2}-2xy)-[4x^{2}-2y+2(xy+y)]\)
\((3).\)先化简,再求值:\(-a^{2}b+(3ab^{2}-a^{2}b)-2(2ab^{2}-a^{2}b)\),其中 \(a=-1\),\(b=-2\).
进入组卷