1 -x^3y^3+2x^2y^2-xy

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/24 08:36:01

1 -x^3y^3+2x^2y^2-xy
2 4x^2-(x^2+1)^2
3 3x^2-3x+四分之三
4 16x^4-y^4
5 8(a-b)^2-12(b-a)
6 25(m-n)^2-9(m+n)^2
这个是^次方的意思

1.-x^3y^3+2x^2y^2-xy
=-xy(x^2y^2-2xy+1)
=-xy[(xy)^2-2xy+1]
-xy(xy-1)^2
2.4x^2-(x^2+1)^2
=(2x)^2-(x^2+1)^2
=(2x+x^2+1)(2x-x^2-1)
=-(x+1)^2(x^2-2x+1)
=-(x+1)^2(x-1)^2
3.3x^2-3x+3/4
=3(x^2-x+1/4)
=3(x-1/2)^2
4.16x^4-y^4
=(4x^2)^2-(y^2)^2
=(4x^2+y^2)(4x^2-y^2)
=(4x^2+y^2)(2x+y)(2x-y)
5.8(a-b)^2-12(b-a)
=8(a-b)^2+12(a-b）
=4(a-b)[2(a-b)+3]
=4(a-b)(2a-2b+3)
6.25(m-n)^2-9(m+n)^2
=[5(m-n)]^2-[3(m+n)]^2
=[5(m-n)+3(m+n)][5(m-n)-3(m+n)]
=(8m-2n)(2m-8n)
=4(4m-n)(m-4n)

1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 计算3xy[2xy-x(y-2)+x-1] (x+y)(x-y)-(2xy+3y)平方【(x-y)^3(x^1/2+y^1/2)^-3+3(x根号y-y根号x)】/(x根号x+y根号y)+(2xy根号xy- xy(xy+1)+(xy+3)-2(x+y+2分之一）-(x+y-1)的平方 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 1/2xy-{1/2xy-[1/3x^2y-(x^2y-xy)]+1/3x^2y} （x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2