解析 (1)-\dfrac{2b}{3c}(2)-\dfrac{1}{2x}(3)\dfrac{1}{m+1}(4)-\dfrac{2c}{3{{b}^{2}}} (1)原式=-\dfrac{2b}{3c}.(2)原式=-\dfrac{1}{2x}.(3)原式=\dfrac{1}{m+1}.(4)原式=-\dfrac{2c}{3{{b}^{2}}}....
解析 解:当a=3,b=2,c= \frac {2}{3}时, \frac {a^{2}-4b}{3c}= \frac {9-4×2}{2}= \frac {1}{2}. 把各字母的值代入即可.本题考查代数式求值.解题的关键是注意运算顺序,要注意解题的准确性.结果一 题目 当a=3,b=2,时,求代数式的值. 答案 当a=3,b=2,时,.相关推荐 ...
Answer to: Find -x when x = -dfrac{49}{39}. By signing up, you'll get thousands of step-by-step solutions to your homework questions. You can also...
Express the equation 125^{-\frac{1}{3 = \frac{1}{5} as the corresponding logarithmic equation \log_b(A) = C \log_b ( ) = where b = Find a logarithmic equation that relates y and x. x 1 2 3 4 5 6 y 1 1.189 1.316 1.414 1.495 1.565 Find a logarit...
商店新进的某型号洗衣机定价1500元,因为销售太旺,第二天涨价\dfrac{1}{5},到第二周发现提价后销售太慢,又降价\dfrac{1}{5}。降价后的价格与原价相比(\quad)A.降价后便宜B.原价便宜C.价格一样的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学
化简:\dfrac{-8abc^4\cdot (ab^2)^2}{-\dfrac{5}{3}ab^3c\cdot \dfrac{3}{10}a^2bc^3 }
解:原式=- \dfrac {4a^{2}}{b^{4}c^{2}}⋅ \dfrac {b^{3}}{9a^{2}c}⋅ \dfrac {27c^{3}}{b^{3}} =- \dfrac {12}{b^{4}}. 原式先计算乘方运算,再计算乘除运算即可得到结果.此题考查了分式的乘除法,以及负整数指数幂,熟练掌握运算法则是解本题的关键.结果一...
Answer to: State whether the equation is true or false: \dfrac{1/x}{a/x - b/x} = \dfrac{1}{a-b}. By signing up, you'll get thousands of...
Answer to: Solve for x given that 3^{x-x^2} = \dfrac{1}{9^x} By signing up, you'll get thousands of step-by-step solutions to your homework...
函数$f(x,y)=\left\{\begin{array}{ll}\dfrac{xy}{~\sqrt{x^2+y^2}~},&x^2+y^2\neq 0;\\0,&x^2+y^2=0.\end{array}\right.$在点$(0,0)$处存在偏导数。( )A.正确B.错误的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的