1.(-1/2x^2*y^3)*2^4*x^5*y^52.(x-y)^3*(y-x)^2*(y-x)^53.8*2^3*32*(-2)^8
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1.(-1/2x^2*y^3)*2^4*x^5*y^52.(x-y)^3*(y-x)^2*(y-x)^53.8*2^3*32*(-2)^81.(-1/2x^2*y^3)*2^4*x^5*y^52.(x
1.(-1/2x^2*y^3)*2^4*x^5*y^52.(x-y)^3*(y-x)^2*(y-x)^53.8*2^3*32*(-2)^8
1.(-1/2x^2*y^3)*2^4*x^5*y^5
2.(x-y)^3*(y-x)^2*(y-x)^5
3.8*2^3*32*(-2)^8
1.(-1/2x^2*y^3)*2^4*x^5*y^52.(x-y)^3*(y-x)^2*(y-x)^53.8*2^3*32*(-2)^8
1.原式=-(1/2×2^4)×(x^2×x^5)×(y^3×y^5)
=-2^3×x^7×y^8
=-8x^7y^8
2.原式=(x-y)^3×(x-y)^2×[-(x-y)^5]
=-(x-y)^3×(x-y)^2×(x-y)^5
=-(x-y)^10
3.原式=2^3×2^3×2^5×2^8
=2^(3+3+5+8)
=2^19
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y)
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简
已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值
1.(-1/2x^2*y^3)*2^4*x^5*y^52.(x-y)^3*(y-x)^2*(y-x)^53.8*2^3*32*(-2)^8
1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y(x-y)^2）/2（x-y)^2
1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2}
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
[(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
(x+3y-4)(2x-y)