有这样一道题:计算(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/18 18:02:22
有这样一道题:计算(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)的值,其中x=2010,y=-1.甲同
把“x=2010”错抄成“x=2001”,但他计算的结果也是正确的,你说这是为什么?
把“x=2010”错抄成“x=2001”,但他计算的结果也是正确的,你说这是为什么?
(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
=2x^4-4x^3y-2x^2y^2-x^4+2x^2y^2-y^3-x^4+4x^3y-y^3
=2x^4-x^4-x^4+4x^3y-4x^3y-2x^2y^2+2x^2y^2-y^3-y^3
=4x^3y-4x^3y-2x^2y^2+2x^2y^2-y^3-y^3
=-2x^2y^2+2x^2y^2-y^3-y^3
=-y^3-y^3
=-2y^3
=-2*(-1)^3
=-2*(-1)
=2
化简结果与x无关,
=2x^4-4x^3y-2x^2y^2-x^4+2x^2y^2-y^3-x^4+4x^3y-y^3
=2x^4-x^4-x^4+4x^3y-4x^3y-2x^2y^2+2x^2y^2-y^3-y^3
=4x^3y-4x^3y-2x^2y^2+2x^2y^2-y^3-y^3
=-2x^2y^2+2x^2y^2-y^3-y^3
=-y^3-y^3
=-2y^3
=-2*(-1)^3
=-2*(-1)
=2
化简结果与x无关,
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
有这样一道题:计算(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(x+3y-4)(2x-y)
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
计算:[(2x - 3y)^2 - (x-y)(4x+2y)] / 2y
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
有这样一道题:计算(2x^4-4x^3-2x^2y^2)-(x^4-2x^2y^2+y3)+(-x^4+4x^3y-y^