(x-2y)的平方-16(x-2y) 64-搜答案-神马作文网

够详细了吧

x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x

25x²+40x(y-x)+16(x-y)²25x²-40x(x-y)+16(x-y)²=[5x-4(x-y)]²=(x+4y)²

2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(

x²-y²=(x+y)(x-y)所以最简公分母(x+y)²(x-y)所以2xy/(x+y)²=2xy(x-y)/(x+y)²(x-y)x/(x&sup

2xy/(x+y)的平方=2xy(x-y)/(x+y)²(x-y)x/x的平方-y的平方=x(x+y)/(x+y)²(x-y)

(x-2y)³+8x²y-16xy=(x-2y)³+8xy(x-2y)=(x-2y)[(x-2y)²+8xy]=(x-2y)[x²-4xy+4y

原式=（x²+2x+1）+（y²-8y+16）=（x+1）²+（y-4）²=0∴x+1=0,y-4=0∴x=-1,y=4y/x=4/-1=-4

双十字相乘.

(（x-y）(x-y))/((x-y)(x+y))=(x-y)/(x+y).

原式=(x+2y)(2x-3y)-x-16y-10十字相乘x+2y2×2x-3y-5x和y系数都符合所以原式=(x+2y+2)(2x-3y-5)

(x+2y)的平方-4x的平方=(x+2y+2x)(x+2y-2x)=(3x+2y)(2y-x)

(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)

（x+y)(x-y)+(x-y)的平方-(6X的平方Y-2XY的平方）/2Y=x²-y²+x²-2xy+y²-3x²+xy=-x²-xy

【2（x-y）²-8（x-y)²（x+y）+6y（x-y）²】÷2（x-y）²=2（x-y）²÷2(x-y)²-8（x-y)²（x

x(x+y)(x-y)-2x(x+y)=x(x(x-y)+y(x-y))-(2x^2+2xy)=x(x^2-xy+xy-y^2)-2x^2-2xy=x(x^2-y^2)-2x^2-2xy=x^3-xy

x8＋256y8-32x4y4(用手机打的不要介意,给个最佳答案吧）

∵4x²-y²+2x-y=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y+1)∴4x²-y²+2x-y=(2x-y)(2x+y+1)不懂得欢迎追

x的平方-x-4y的平方+2y=(x-2y)(x+2y)-(x-2y)=(x-2y)(x+2y-1)

(x平方+2xy+y的平方）/（x+y)=（x+y)²/(x+y)=x+y