共50条信息
计算:\(\sqrt[3]{-27}+( \sqrt{3}{)}^{2}-( \sqrt{2}-1) \)
先化简,再求值:\({{(2x-1)}^{2}}-2(x-1)(x+1)-x(x-2)\),其中\({{x}^{2}}-2x-3=0\).
计算:
\((1) \sqrt{25}- \sqrt[3]{-27}+ \sqrt{ \dfrac{1}{4}}\)
\((2)\sqrt{{{\left( -2 \right)}^{2}}}+\left| \sqrt{2}-1 \right|-\left( \sqrt{2}+1 \right)\)
已知多项式\(A\)与\(B\),其中\(A=3{{x}^{3}}+6x-2\),\(B=-3{{x}^{2}}+4x-7\).
\((1)\)求\(3A+B\);
\((2)\)求\(A-2B\).
\((2) 2x-1=3x+2\)
\((4)3(ab-5b^{2}+2a^{2})-(7ab+16a^{2}-25b^{2}).\)
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:
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 \(a=-1\),\(b=-2\).
\(3(x - 3y)- 2(y - 2x)\)
进入组卷