(x y-2)的平方化简-搜答案-智慧作业帮

2x²-[-3(-1/3x²-2/3xy)-2y²]-2(x²-xy+2y²)=2x²-[x²+2xy-2y²]-2x&

=1/2x²y³*9x²y²+4x²y²*x³y³+1/16y²*8x³y³=9/2x^4

所求之数值是1.[(xy+2)(xy-2)-(xy+2)²+8]÷(2x)={(xy+2)[(xy-2)-(xy+2)]+8}/(2x)=[(xy+2)(xy-2-xy-2)+8]/(2x)

(xy-x的平方）除以xy分之x的平方-2xy+y的平方乘x的平方分之x-y=x(y-x)*xy/(x-y)²*（x-y）/x²=-y再问：不好意思，打错了(xy-y的平方）除以x

(4-x²)/(x²y-2xy)=-(x²-4)/(x²y-2xy)=-(x+2)(x-2)/xy(x-2)=-(x+2)/xy愿对你有所帮助!

(3x^2-xy)/(3x^2+5xy-2y^2)=x(3x-y)/[(3x-y)(x+2y)]=x/(x+2y)

原式=x(x+y)分之x(x-y)=(x+y)分之(x-y)

x的平方-2xy/xy-2y的平方＝x(x-2y)/y(x-2y)=x/y

2（x²y+xy）-3（x²y+xy）-4x²y=-（x²y+xy）-4x²y=-5x²y-xy=-xy（5x+1）=1×2（-5+1）=-

原式=-12x²+3xy+4x²+4xy-24=-8x²+7xy-24

|x+3|+(y-1/3)的平方=0|x+3|=0,(y-1/3)的平方=0x=-3y=1/33x²y-[2xy²-2(xy-2/3x²y)-xy]+3xy²=

1,4x²y-2xy²-5xy²+2x²y＝6x²y－7xy²；2,（x²-y²-2xy）-（-3x²+4xy

（5x的平方-2xy的平方-3xy）-(2xy+5x的平方y-2xy的平方）=5x^2-2xy^2-3xy.+2xy^2-2xy-5x^2y=5x^2-5xy-5x^2y=5x(x-y-xy),当x=

/>|x+2|+|y-1/2|=0x+2=0x=-2y-1/2=0y=1/23x^2y-[2x^2y-(xy^2-2x^2y)-4xy^2]=3x^2y-2x^2y+xy^2-2x^2y-4xy^2=

能把等式照下来吗

（x-y+根号2y）*（x-y-根号2y）

原式=3x²-3xy+xy-3x²+xy+1-x²=-x²-2xy+xy+1=-x²-xy+1将x=0.2y=1代入=-0.04-0.2+1=-0.2

2(x的平方+xy）-3(xy的平方-xy)-4x的平方y=2x²+2xy-3xy²+3xy-4x²y=2x²+5xy-xy（3y+4x）

解(y²-xy)/(x²-y²)=y(y-x)/(x+y)(x-y)=-y/(x+y)(2x²-2y²)/(x²+2xy+y²)=