1、(1/2)x^2-(1/2)y^2+(3/2)x-(7/2)y-5

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/23 19:27:30

1、(1/2)x^2-(1/2)y^2+(3/2)x-(7/2)y-5
2、2x^(n+6)-10x^(n+3)-4x^n+10x^(n-3)+2x^(n-6)

1、=1/2[(x+y)(x-y)+3x-7y-10]
=1/2(x+y+5)(x-y-2)

2、=2x^(n-6) [x^12-5x^9-2x^6+5x^3+1]
=2x^(n-6)[(x^6-1)²-5x³(x^6-1)]
=2x^(n-6)(x^6-1)(x^6-5x³-1)
=2x^(n-6)(x^6-5x³-1)(x+1)(x-1)(x²+x+1)(x²-x+1)

1、x(x-y)(x+y)-x(x+y)^2 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y (1)(x^2/x)-y-x-y （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 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 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9