方程x³ 2x²-3x=0的解集-搜答案-大师作文网

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

(x+1)(x-1)=2√2xx^2-1=2√2xx^2-2√2x=1x^2-2√2x+2=1+2(x-√2)^2=3x-√2=±√3x1=√3+√2x2=-√3+√2x^2-3x+1=0x^2-3x

两边乘以(x+1)(x-1)得x²-3x+(2x-1)(x+1)=0x²-3x+2x²+x-1=03x²-2x-1=0(3x+1)(x-1)=0∴x=-1/3x

方程x(x-3)=6-2x的解

x(x-3)=6-2xx²-3x=6-2xx²-x-6=0(x-3)(x+2)=0x1=3x2=-2

x的平方-3x分之x+3+3-x分之2=0x+3+2(-x)=0;x-2x+3=0;x=3;带入检验是增根；所以无解；很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,

X²-2X-3=0(X-3)(X+1)=0X-3=0,X+1=0X=3,X=-1

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

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

两边乘以x(x-1)得3x-(x+2)=03x-x-2=02x=2∴x=1检验：x=1是增根∴原方程无解

intf(floatx)返回值,错了.

解方程：2x*x+3x-3=0

2x*x+3x-3=02x*x+3x=3x*x+3x/2=3/2(x+3/4)^2=3/2+9/16(x+3/4)^2=33/16x+3/4=±√33/4x=(-3±√33)/4如还不明白,请继续追问

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)=

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)

x(x+3)-x(1-2x)=1+3x²x²+3x-x+2x²=1+3x²x²+3x-x+2x²-3x²=12x=1x=2分之1

(x^2+x)(x^2+x-3)-3(x^2+x)+8=0（x^2+x)^2-6(x^2+x)+8=0(x^2+x-4)(x^2+x-2)=0x^2+x-4=0x^2+x-2=0(x+1/2)^2=1

2x²＋x＋3＝0,2(x²＋2·x·¼＋(¼)²)＝－3＋(1/8).2(x＋¼)²＝－23/8.(x＋¼)²

两边乘(3x+2)(x+3)3x²+8x-3-3x²-29x-18=021x=-21x=-1分式方程要检验经检验,x=-1是方程的解