方程x^2-5x=0,的解
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/19 14:22:41
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当x>=1时,x方-2x-(x-1)=5,(x-4)(x+1)=0,x=4当x
4/(x-2)+(x-1)/[(x-2)(x-3)]-2/(x-3)=0[4(x-3)+(x-1)-2(x-2)]/[(x-2)(x-3)]=03(x-3)/[(x-2)(x-3)]=0不知道解了~~
x(x^2-2)+2x^2(x+3)-3x(5x-7)=x(3x^2-9x+17)+2=>x^3-2x+2x^3+6x^2-15x^2+21x=3x^3-9x^2+17x+2=>2x=2x=1
【解法一】【解法二】5x(x+7)(x+4)=5x(x^2+11X)5x(x²+11x+28)-5x(x²+11x)=05x^3+55x^2+140x=5x^3+55x^25x(x
只有一个实根.设f(x)=x^3+2x-19为单调增函数.所以只有一个实根.下面来求这个实根由于f(2)=-7f(3)=11所以这个根在(2,3)内.利用二分法求这个解.取x0=5/2f(5/2)=1
x的5次方-x的3次方-2x=0x(x^4-x^2-2)=0x(x^2+1)(x^2-2)=0x(x^2+1)(x+根号2)(x-根号2)=0x=0或x=-根号2或x=根号2再问:谢谢,请问还有一题怎
intf(floatx)返回值,错了.
2x^2-5x-x^2-2x=x^2-6-7x=-6x=6/7
两边除以5x²+x/5=1x²+x/5+1/100=1+1/100(x+1/10)²=101/100x+1/10=±√101/10x=(-1-√101)/10,x=(-1
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
3(x-2)=5x(2-x)3(x-2)-5x(2-x)=03(x-2)+5x(x-2)=0(x-2)(3+5x)=0解得x=2或-3/54x(3x+8)-5(3x+8)=0(3x+8)(4x-5)=
3x^2-x(2x+3)=x(x-5)-2(2x+3)3x^2-2x^2-3x=x^2-5x-4x-66x=-6x=-1
(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)(x+2-1)/(x+2)+(x+7-1)/(x+7)=(x+3-1)/(x+3)+(x+6-1)/(x+
两边*22x-10=xx-10=0x=10
显然x=0是一个解x≠0两边除以xx|x|-5|x|+2=0x0,且x1+x2=5>0x1x2=2>0所以是两个正跟所以一共4个
3x的二次+5x=0x(3x+5)=0x1=0x2=-5/39x的二次=(x-2)的二次9x²-(x-2)²=0(3x+x-2)(3x-x+2)=0(4x-2)(2x+2)=0(2
(x的平方-2x)-5(x-2)=x(x-2)-5(x-2)=(x-2)(x-5)=0x-2=0或x-5=0x1=2x2=5
6/(x²+5x)-3/(2x+10)=06/(x²+5x)=3/(2x+10)2/x(x+5)=1/2(x+5)2/x=1/2x=4经检验:x=4是原方程的解.再问:确定对吗?再