方程的解:2x²-x-4=0

4x^2+2x√(3x^2+x)+x-9=03x^2+x+2x√(3x^2+x)+x^2-9=0[√(3x^2+x)]^2+2x√(3x^2+x)+x^2=9[√(3x^2+x)+x]^2=9√(3x

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~~

由题意可知：x≠-1且x≠0而方程x²-3x-4=0可化为：(x-4)(x+1)=0解得：x=4（另x=-1不合题意,舍去）所以：(x²-2x)/(x+1)·(1+1/x)=x(x

x^4-2x^3+2x^3-4x^2-3x^2+6x-2x+4=0x^3(x-2)+2x^2(x-2)-3x(x-2)-2(x-2)=0(x-2)(x^3+2x^2-3x-2)=0x=2;

【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

4(123-x)=57+x492-4x=57+xx+4x=492-575x=435x=87

#include#includeintmain(){doublex=1,x2;do{x2=x;x-=(2*x*x*x-4*x*x+3*x-6)/(6*x*x-8*x+3);}while(fabs(x-

intf(floatx)返回值,错了.

3x/(x+1)-(x+4)/(x^2+x)=-23x^2-(x+4)=-2(x^2+x)3x^2-x-4=-2x^2-2x5x^2+x-4=0(5x-4)(x+1)=0x1=4/5x2=-1经检验,

2/x^2+x+3/x^2-x-4/x^2-1=0(2/x^2+3/x^2-4/x^2)+x-x-1=01/x^2-1=01/x^2=1x^2=1x=1或-1

4x^2+2x√(3x^2+x)+x-9=0,——》(4x^2+x-9)^2=4x^2*(3x^2+x),——》4x^4+4x^3-71x-18x+81=(x-1)(4x^3+8x^2-6x+81)=

简单的分类讨论：x²-4x+8=0,无解【b²-4ac＜0】一般c太大,都是无解的、x²-4x=0,x1=4x2=0即为最终答案、楼主!

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)=

2x³-x²+4x-2=0x²(2x-1)+2(2x-1)=0(x²+2)(2x-1)=0∵x²+2≥2∴2x-1=0∴2x=1∴x=2分之1很高兴为

x(x+1)(x²-2x-4)=0x1=0x2=-1x²-2x-4=0x²-2x+1=5(x-1)²=5x3=1+√5x4=1-√5x³-2x+1=0

X^4-7X^2+4X+4=x^4-2x^3+2x^3-4x^2-3x^2+6x-2x+4=x^3(x-2)+2x^2(x-2)-3x(x-2)-2(x-2)=(x-2)(x^3+2x^2-3x-2)

因为等比数列：设4个根为：a,aq,aq^2,aq^3a+aq+aq^2+aq^3=4.1a*aq*aq^2+a*aq*aq^3+a*aq^2*aq^3+aq*aq^2aq^3=-56.2a*aq*a

你好把x^2-x当作整体,(x^2-x)^2-2*4*(x^2-x)+12=0(x^2-x-6)(x^2-x+2)=0因为x^2-x≥-1/4所以x^2-x-6=0(x-3)(x+2)=0x=3或-2