12x2+13x=5x http://www.tiger-algebra.com/drill/12x~2_13x=5x/ 12x2+13x=5x Two solutions were found : x = -2/3 = -0.667 x = 0 Rearrange: Rearrange the equation by subtracting what is to the right of ...
x→0+lim(x2) 来自Web 搜索的类似问题 limx→0+xn1 (epsilon-delta proof)? https://math.stackexchange.com/q/2463149 You have the right idea, but to write a proper proof you should first fix a putative upper limit M and show that there ...
计算\left( 2x+1 \right)\left( 3x-2 \right)的结果是 . 相关知识点: 试题来源: 解析 6{{x}^{2}}-x-2. \left( 2x+1 \right)\left( 3x-2 \right)=2x\left( 3x-2 \right)+1\times \left( 3x-2 \right)=6{{x}^{2}}-4x+3x-2=6{{x}^{2}}-x-2....
\left| x+1 \right|-2=0,\left| x+1 \right|=2,x+1=2或x+1=-2,可得x=1或者x=-3;综上所得零点有1-1-3 ,依次零点可以将数轴分成四段.⑴ x\leqslant -3,原式=\left| -\left( x+1 \right)-2 \right|-\left( x+3 \right)=\left| -x-3 \right|-x-3=-x-3-x-3=-2x-6...
百度试题 结果1 题目\left|2x-1\right|=\left|3x+1\right|求解x的值. 相关知识点: 试题来源: 解析 x=-2或x=0. ∵\left|2x-1\right|=\left|3x+1\right|∴2x-1=3x+1或2x-1=-3x-1移项得,x=-2或x=0.反馈 收藏
解方程①left(2x-1right)^2=9(直接开平方法)②x^2+3x-4=0(用配方法)③x^2-2x-8=0(用因式分解法)④left(x+1right)lef
解析 left ( (x+3) right )left ( (x-3) right )-xleft ( (x-2) right )=x^2-9-x^2+2x=2x-9把x=4代入原式=2times 4-9=-1.left ( 1 right )前两项相乘可运用平方差公式.left ( 2 right )后两项相乘可运用去括号法则.left ( 3 right )乘积前面是“-”,因此去括号应注意...
二项式(left(2x-1right))^5的展开式的各项中,二项式系数最大的项为( )A. 20xB. 20x和-40x^2C. -40x^2和80x^3D. 80
容易知\left| 2x+1 \right|-{{x}^{2}}=4或\left| 2x+1 \right|-{{x}^{2}}=-4.当x\geqslant -\frac{1}{2}时,有{{x}^{2}}-2x+3=0或者{{x}^{2}}-2x-5=0.第一个方程无实根,第二个方程的解为{{x}_{1,2}}=1\pm \sqrt{6}.1-\sqrt{6}<{}-\frac{1}{2},舍去...
left ( 2 right )由left ( 1 right )知,y=x^2为偶函数,y=x^3为奇函数, 则y=x^2图象关于y轴对称,y=x^3图象关于原点对称; 综上所述,结论:y=x^2图象关于y轴对称,y=x^3图象关于原点对称 left ( 3 right )当xgt 0时,对函数y=x^2求导得:y'=2xgt 0; 对函数y=x^3求导得:y'=3x^2gt...