27(x-2)=-64

2000的立方根=1000的立方根×2的立方根=10×1.260=12.600.002的立方根=0.001的立方根×2的立方根=0.1×1.260=0.1260再问：27x的立方-152=0，求x再答

3^x*9^2x*27^x=9^83^x*(3^2)^2x*(3^3)^x=(3^2)^83^x*3^4x*3^3x=3^163^(x+4x+3x)=3^16x+4x+3x=168x=16x=2

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

 再答：对吗？再问：，没过程再问：，没过程再问：，没过程再答：不是有过程了吗？再问：哦谢谢

1/(3-x)-2=1/(x-3)+(4-2x)/(3x^2-27)移项：1/(3-x)-2-1/(x-3)-(4-2x)/(3x^2-27)=0-1/(x-3)-2-1/(x-3)-2(2-x)/{

化简得：-x+7y=11①7x+3y=27②①式×7得：-7x+49y=77③②+③得：52y=104∴y=2代入①得：x=3∴x=3,y=2再问：亲，是代入法哦！再答：代入法①式得3x+3y-4x+

（1）5x+2=3x^23x^2-5x-2=0(3x+1)(x-2)=0x=-1/3;x=2(2)x^2+12x+27=0(x+3)(x+9)=0x=-3;x=-9

x-1/2x+27=4/5x可以写成1/2x+27=4/5x,即27=（4/5x-1/2x）,27=(8/10-5/10)x,27=3/10x,所以x=27/(3/10)=90

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31

1、2x-4–12x+3=9-9x-10x-1=9-9xx=-102、9x+64=100-9x18x=36x=23、15-8+5x=7x+4-3x7+5x=4x+4x=-34、3x-21-2(9-8+

2X^2+3X=272X^2+3X-27=0(X-3)(2X+9)=0X=3,X=-9/25x^3-3x^2-32x-12=(5x^3-15x^2)+(12x^2-36x)+(4x-12)=5x^2(

2(1-x)(1-x)=72(x-1)^2=36x-1=正负6x1=7x2=-5(x+2)(x+2)(x+2)=-27/64(x+2)^2=-27/64x+2=-3/4x=-2-3/4x=-11/4

27X^3=64x³=64/27x=4/32X^2-1=972x²=98x²=49x=7或x=-7

x/x(x-1)+2=2x/(x+1)1/(x-1)+2=2x/(x+1)x+1+2(x-1)(x+1)=2x(x-1)x+1+2x²-2-2x²-2x=0-x-1=0-x=1x=

1,应该是x是几次幂就有几个根吧,所以应该是7+2=9个2.-7.036622145,-6.489288572,-6.200988153,-4.734373320,-4.289168546,-2.77

答：|x|=x+2>=0,x>=-2两边平方得：x^2=x^2+4x+44x+4=0x=-19x^2011+3x+27=-9-3+27=15

5（x+x+27）-38=1475（2x+27）=1852x+27=372x=10x=5

18/（2X+9）=54/7x（两边同时除以18）1/（2x+9）=3/7x（交叉相乘）7x=3(2x+9)7x=6x+277x-6x=27x=27x√x²+2x+1=x√(x+1)