X^3-2X 2怎么化(X-1)^2(X 2)
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设(x²-1)/(x²+2x)=t则8t+3/t=118t²-11t+3=0(8t-3)(t-1)=0解得t=3/8或t=11.t=3/8(x²-1)/(x
原式=x³-6x²-9x-2x²+12x+18-(x²-5x)(x-3)=x³-8x²+3x+18-(x³-3x²-5x
原式=3x2-x3+x3-2x2+1=x2+1=3+1=4
后面的x²+11x-708有误吧!再问:没有题目就这样能不能帮我再答:那我就试试:原式为:1/x2+x+1/x2+3x+2+1/x2+5x+6+1/x2+7x+12+1/x2+9x+20=5
so easy、、提示一下,望采纳
[3x/(x-1)-x/(x+1)]÷x/(x²-1)=[3x/(x-1)-x/(x+1)]*(x²-1)/x=[3x/(x-1)]*(x²-1)/x-[x/(x+1)]
把x2+5x看成是一个未知数Y,就可以解了
原式=(x²+3x+9)/(x-3)(x²+3x+9)-6x/x(x-3)(x+3)-(x-1)/2(x+3)=1/(x-3)-6/(x-3)(x+3)-(x-1)/2(x+3)=
19.1/(1-x)当x=根号2+1时,答案=-根号2/221:1/(x+3),当x=2时,答案=1/520:3-a当=根号3-3,答案=6-根号322:(1-根号2)/2
1/(x2-5x+6)-1/(4x-x2-3)-1/(3x-x2-2)=1/(x2-5x+6)+1/(x2-4x+3)+1/(x2-3x+2)=1/(x-2)(x-3)+1/(x-3)(x-1)+1/
原式=lim(x->∞)[(x²+2x+5)/(3x²-x+1)]=lim(x->∞)[(1+2/x+5/x²)/(3-1/x+1/x²)]=(1+2*0+5*
f(-x)=(-x)^2-2|-x|-1=x^2-2|x|-1=f(x)且定义域对称所以是偶函数
要过程吗?再问:要再答:
原式=[3x/(x-1)-2x/(x+1)]*(x+1)(x-1)/x=3x/(x-1)*(x+1)(x-1)/x-2x/(x+1)*(x+1)(x-1)/x=3(x+1)-2(x-1)=3x+3-2
原式=[x+2x(x-2)-x-1(x-2)2]÷x2-16x2+4x=[x2-4x(x-2)2-x2-xx(x-2)2]÷x2-16x2+4x=x-4x(x-2)2•x(x+4)(x+4)(x-4)
x²+x-1/(x²+x)=3/2两边同时乘以(x²+x)得:(x²+x)²-1=3(x²+x)/22(x²+x)²-3
把一个整体的加上括号后再发出来,你的这个实在分不清没法帮忙啊.再问:化简求值(x/x-1)-(x3/x∧2-1)x(x∧22x1/x3)其中x=√21这样可以吗?再答:我描述下吧你看看是不是x/x-1
X+3X+9/X-27+6X/9X-X-X-1/6+2X=X-X+3X-X+2X+9/X-27+2/3-1/6=4X+9/X-27+(4-1)/6=4X+9/X-27+1/2=4X+9/X-(54-1
令(x^2-1)/x=t3/t+t/2=5/2t^2-5t+6=0t=2或t=3即:(x^2-1)/x=2或(x^2-1)/x=3x^2-2x-1=0或x^2-3x-1=0x=1±√2或x=(3±√1
因为x²+6x+9=(x+3)²记住一个公式:(a+b)²=a²+2ab+b²,得出这个公式很简单,你可以自己乘一下,(a+b)(a+b)=a