x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2
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x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)
x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2
x^2-20x+20=0
同样!
x^2=(x-4)^2+(x-2)^2
x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2
x^2-20x+20=0
x^2-20x+19+1=0
(x-1)(x-19)+1=0
(x-1)(x-19)=-1
(1-x)(x-19)=1
x^2=(x-4)^2+(x-2)^2
x^2=(x-2-2)^2+(x-2)^2
x^2=2(x-2)^2-4x+8+4
2(x-2)^2-(x^2+4x+12)=0
2(x-2)^2-(x-2)(x+6)=0
(x-2)[2(x-2)-(x+6)]=0
(x-2)(x-10)=0
(x-10)^2=80
x-10=4根号5
x=4根号5+10
x^2-20x+20=0同样!x^2=(x-4)^2+(x-2)^2
x(x+2)(x+6)+20x+6=0
（20-2x)(20-2x)x>400 x=?
x-10+X+20+X/2+2X=370
x+10+x-20+2x+x/2=370
x/2+x/8+x/12+x/20=1
(2-x)(6-x)(12-x)(20-x)=
(x+2)(x-3)>0这个不等式的解集是不等式组x+2>0 与 x+20 x-30}={x/x>3}.{x/{x+2
2x(x-1)-x(3x+2)=(-x-1)(x+6)-20
解方程X(X+1)-X(X-3)=2(X+1)(X-1)+20
x(x+1)²-x(x²-3)-2(x+1)(x-1)=20
15X(4X-8)-5X(2X+10)=6X(5X-20)
一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
x^3-11x^2+34x-20=0
4x^2+4x+1>=0 -4+x-x^20 16-8x+x^2
x^2-10x+20=0
x²+2x-20=0
x^2-20x+96=0