2X方加XY减Y方减4X-搜答案-智慧作业帮

原式=(x+2Y)(x^2+(2y)^2-2xy)(x-2Y)(x^2+(2y)^2+2xy)=(x^3+(2Y)^3)(x^3-(2Y)^3)=(x^6-(2Y)^6)

x减2y分之x减y除以x方减4xy加4y方分之x方减y方=[(x-y)/(x-2y)]×[(x-2y)²/(x+y)(x-y)]=(x-2y)/(x+y)=[(1+√2-2(1-√2)]/(

由（1）x²-xy=5（2）y²+xy=-2∴（1）+（2）得：x²+y²=3.

见图

x²＋xy－2y²＝0﹙x－y﹚﹙x＋2y﹚＝0x＝y,x＝－2y当x＝y,﹙x²＋3xy＋y²﹚／﹙x²＋y²﹚=﹙y²＋3y&

很高兴喂你解答!原式=4√[(x^2+xy+y^2)/(x-y)*1/2√[(x^2-xy+y^2)/(x+y)*3√(x^3+y^3)=6√[(x^2+xy+y^2)/(x-y)*√[(x^2-xy

x⁴-2y⁴-2x³y+xy³=(x+y)(x-2y)(x²-xy+y²)

再问：图片看不全再答：能看到了吧？

4y⁴-4x³y+0.2x²y²+xy³-0.2x²y²-4y⁴-x³yx=-2,y=0.3=-5x

x²+2xy+4y²+x²y²+1=8xy(x²-4xy+4y²)+(x²y²-2xy+1)=0(x-2y)²

(X-2)的平方加根号Y加三=0x-2=0,y+3=0x=2,y=-3-4y³-(xy-x²)=-4×(-27)-(-6-4)=108+10=128再问：最后一步：108加10=1

已知x=二分之一,xy(y加y的二次方)减y的二次方(xy-x)+2x(x-y的平方)的值=xy²+xy³-xy³+xy²+2x²-2xy²

先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+

x^2+y^2=4,设x=2cosa,y=2sina,则x^2-2√3xy-y^2=4(cosa)^2-8√3cosasina-4(sina)^2=4cos2a-4√3sin2a=8cos(2a+60

(x＋y)/(x)=31＋(y/x)=3得：y/x=2则：(x²＋y²)/(x²－xy＋y²)【分子分母同除以x²】=[1＋(y/x)²]/

x³y³－2x²y²＋xy＝xy（x²y²－2xy＋1）＝xy（xy－1）²

x³-y³-x²y+xy²=(x³-y³)-(x²y-xy²)=(x-y)(x²+xy+y²)-xy

X方加2XY加2Y方减4Y加5=(X²+2XY+Y²)+(Y²-4Y+4)+1=(X+Y)²+(Y-2)²+1当Y=2,X=-2时,原式的值最小,为1

2x^2+xy-y^2-4x+5y-6双十字相乘法,2x^2+xy-y^2-4x+5y-62x-y2xy-3（2x-y+2)(x+y-3)或者待定系数法.有问题追问再问：谢谢谢谢谢谢谢你再答：不用谢