“计算(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2)的值,其中x=
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“计算(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2)的值,其中x=二分之一,
之一“错抄成”x=-二分之一,但他计算结果也是正确的,试说明理由,并求出这个结果
之一“错抄成”x=-二分之一,但他计算结果也是正确的,试说明理由,并求出这个结果
∵(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2)
=2x³-3x²y-xy²-x³+2x²y+y³-x³+x²y+xy²
=y³
∵(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2)的值y³与x无关
=2x³-3x²y-xy²-x³+2x²y+y³-x³+x²y+xy²
=y³
∵(2x^3-3x^2y-xy^2)+(-x^3+2x^2y+y^3)-(x^3-x^2y-xy^2)的值y³与x无关
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
先化简再求值{(x-y)(x+y)-(x+y)(x-2y)}/y 其中xy的值是代数式{(3x-2y-7)^2+|2x+
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)