试题来源: 解析 B 正确答案:B解析:对于所有实数(real number)v,运算(operation)v*被定义为方程v*=v-v/3,若(v*)*=8,那么v等于多少?本题的正确答案是B。由题意可得:v*=v-v/3=2v/3→(v*)*=2/3×2/3×v=4v/9=8 → v=18反馈 收藏 ...
选项 A 中,分母不能为 0,所以 x - 1 ≠ 0,即 x ≠ 1,定义域不是所有实数。选项 B 中,根号下的数须大于等于 0,即 x - 1 ≥ 0,x ≥ 1,定义域不是所有实数。选项 C 中,对于任何实数 x,x^2 都有意义,定义域为所有实数。选项 D 中,对数中的真数须大于 0,即 x - 1 > 0,x > 1,定义...
For all real numbers v,the operation v * is defined by the equation v*= v-3.If (v*)*=8,then v =A 15 B 18 C 21 D 24 E 27 相关知识点: 试题来源: 解析 题目有错原题应为“…… by the equation v*= v-v/3.If (v*)*=8……”∵v*= v-v/3∴v*= 2/3 v∵ (v*)*=8...
(Type your answers in radians. Use angle measures greater than or equal to0and less than2π.Use integers or decimals for any numbers in the expression. Do not rot needed. Use ascending order.) C.There are a finite number of solutions...
first root of unity and the root of unity opposite of it,as both are on the real axis in the complex plane.These two roots of unity are±l,and dilating by2 gives±2.The sum of the squares is (2)2+(-2)2=(A)8 Solution 2 Notice that we can change the equation to be x256=...
The domain of the function f(x)=1/x is? A. All real numbers B. All positive real numbers C. All negative real numbers D. All real numbers E. xcept 0 相关知识点: 试题来源: 解析 D。解析:函数 f(x)=1/x,当 x=0 时,分母为 0,无意义。所以定义域是所有实数除了 0。
6. Prov e that for all real numbers x1, x2, y1, y2, 21, z2 withx_10,x^20,x_1y_1-z_1^2 0 x_2y_2-z_2^20 , th e ineq 1/(x_1)+1/(x_2)+x_1(x_2)/(x_1+x_2))≤1/(x_1+x_2) s s e 8isfied. Giv e necessary and sufficient conditions for equality....
【题目】For all real numbers w, a, y, and z, such thatx+y+z=73 and ωy which of the following statements is true? ( A. x+y+ω73B. x+y+ω=73C. ω+y+z=73D. x+y+ω73E. x+w+z73 相关知识点: 试题来源: 解析 【解析】E ...
Determine all real numbers a > 0 for which there exists a nonnegative continuous function f(x) defined on [0, a] with the property that the region R = \((x,y);0≤ x≤ a,0≤ y≤ f(x)\) has perimeter k units and area k square units for some real number k. 相关知识点: ...
百度试题 结果1 题目For all real numbers and , is equivalent to which of the following? ( ) A. B. C. D. 相关知识点: 试题来源: 解析 D 反馈 收藏