作业帮计算x^2 xye^(x^2 y^2)在区域D上的二重积分
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/17 07:37:02
等于1/X*（X-Y）
(x-3y)(y+2x)-(4y-3x)(3x+4y)=2x^2-3y^2-5xy+9x^2-16y^2=11x^2-5xy-19y^2
(x+y)(x+y)^2(-x-y)^3=－(x+y）^6
原式=x²+xy-2y²+4x²-y²=5x²+xy-3y²
【x²+xy/（x-y）】/【xy/（x-y）】=【x²（x-y）/（x-y）+xy/（x-y）】/【xy/（x-y）】={【x²（x-y）+xy】/（x-y）}/【xy
(x-y)^2*(y-x)^2*(x-y)^6=(x-y)^2*(x-y)^2*(x-y)^6=(x-y)^10再问：能详细一点吗?我,初一的再答：(x-y)^2=(y-x)^2=(x-y)^2*(x
(-x-2y)*(3x-y)=-3x^2-5xy+2y^2
16(x+y)^8/9(x-y)^8=16/9*[(x+y)/(x-y)]^8哪个好理解用哪个.再问：有过程没。。。再答：这个过程其实没什么好研究的。。。[3(x-y)^2(x+y)^-2/4(x+y
=1/2x-1/(x+y)×[(x+y)/2x-(x+y)]=1/2x-1/2x+1=1/x+1=(x+1)/x
原式=(2x²+8xy-3xy-12y²)-(3x²-6xy+xy-2y²)=2x²+8xy-3xy-12y²-3x²+6xy-x
(2x+y)(x-3y)=2x(x-3y)+y(x-3y);y(x-3y)+y(x+3y)=2xy;所以2x(x-3y)+2xy=2x(x-3y+y)=2x(x-2y);2x(x-2y)÷(2x)=x
2x/(x^2-y^2)+3x/(y^2-x^2)+y/(x+y)(y-x)=2x/(x+y)(x-y)-3x/(x+y)(x-y)-y/(x+y)(x-y)=(2x-3x-y)/(x+y)(x-y)
解代数式得：-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!
[(y-x)^3]*[(x-y)^m]-[(x-y)^(m+2)]*(y-x)=-[(x-y)^3]*[(x-y)^m]+[(x-y)^(m+2)]*(x-y)=-[(x-y)^(m+3)]+[(x-
分式线下的代数式请加括号,否则有歧义!再问：再问您一道题e^y(dy/dx)+1)=1再问：我用分离变量算了，就是跟答案不一样再问：您帮忙写一下详细过程再答：是否是e^y(dy/dx+1)=1?若是，
(x-2y)^2-4(2x+y)(y-2x)+4x(y-2)=x^2-4xy+4y^2-4(y^2-4x^2)+4xy-8x=x^2-4xy+4y^2-4y^2+16x^2+4xy-8x=17x^2-
(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2=(x-y)^7÷(x-y)^6+[-(x+y)^3]÷(x+y)^2=(x-y)+[-(x+y)]=x-y-x-y=-2y