计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中,x=1/2,y=1

来源：学生作业帮助网编辑：六六作业网时间：2024/11/24 13:26:59

计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中,x=1/2,y=1计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+

计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中,x=1/2,y=1
计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中,x=1/2,y=1

计算（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)的值,其中,x=1/2,y=1
（2X^3-3X^2Y-2XY^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)
=2x^3-3X^2Y-2XY^2-X^3+2XY^2-Y^3-X^3+3X^2Y-Y^3
=2x^3-X^3-X^3-3X^2Y+3X^2Y-2XY^2+2XY^2-Y^3-Y^3
=-2Y^3
=-2×（1）^3
=-2

=2x³－3x²y－2xy²－x³＋2xy²－y³－x³＋3x²y－y³
=－2y³
以x=1/2、y=1代入，得：
原式=－2

计算：3xy[2xy-x（y-2）+x] 计算3xy[2xy-x(y-2)+x-1] （x^2+xy/x-y)/（xy/x-y)计算计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x）计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 计算:(x^2-2xy)/(x^2-3xy+2y^2)-(xy+y^2)/(x^2-y^2) 计算2x*(-3xy)²(-x²y)³ 计算：（x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3 -2x(3x-7y)+(x-y)(x^2+xy+y^2）计算计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 计算(-xy)(x+2x²y) 计算3y/(2x+2y)+2xy/x^2+xy 计算(3x^3y-x^2y+1/2xy)÷(-1/2xy）计算：2x+2y分之3y + x²+xy分之2xy 计算：3y/(2x+2y) +2xy/x²+xy 计算 (21xy^3-7x^2y^2+28x^3y)÷(-7xy)