已知|x|=3,|y|=2,求3x^2y-[2xy^2-2(3x^2y+2xy^2)]

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/06/16 04:49:52

已知|x|=3,|y|=2,求3x^2y-[2xy^2-2(3x^2y+2xy^2)]
^表示次方

3x^2y-[2xy^2-2(3x^2y+2xy^2)]
=3x^2y-2xy^2+6x^2y+4xy^2
=9x^2y+2xy^2
因为x的绝对值是3,y的绝对值是2
所以式子可以化成
9*9^y+8x
当x=3,y=2时.=753
当x=-3,y=2时.=709
当x=3,y=-2时.=24+1/9
当x=-3,y=-2时.=-24+1/9
希望可以帮你解惑~

已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值. 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理. 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知x+y=3xy,求2x+2y-xy/x+y+2xy的值、已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值. 已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知3x=xy+3y,求2x+xy-2y/y-x-xy的值已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y