搜狗做题网当x=2011,y=-2012时,
来源：学生作业帮 编辑：搜狗做题网作业帮 分类：数学作业 时间：2024/05/01 13:25:36
当x=2011,y=-2012时,
求代数式（x的4次方-y的4次方/x²-2xy+y²）²÷（x²+y²/y-x）²的值
求代数式（x的4次方-y的4次方/x²-2xy+y²）²÷（x²+y²/y-x）²的值
[(x^4-y^4)/(x²-2xy+y²)]²÷[(x²+y²)/(y-x)]²
=(x^4-y^4)²/(x-y)^4÷[(x²+y²)²/(x-y)²]
=(x^4-y^4)²/(x-y)^4×(x-y)²/(x²+y²)²
=(x²+y²)²(x²-y²)²/(x-y)²/(x²+y²)²
=(x²-y²)²/(x-y)²
=(x+y)²(x-y)²/(x-y)²
=(x+y)² 将x=2011,y=-2012代入
=(-1)²=1
=(x^4-y^4)²/(x-y)^4÷[(x²+y²)²/(x-y)²]
=(x^4-y^4)²/(x-y)^4×(x-y)²/(x²+y²)²
=(x²+y²)²(x²-y²)²/(x-y)²/(x²+y²)²
=(x²-y²)²/(x-y)²
=(x+y)²(x-y)²/(x-y)²
=(x+y)² 将x=2011,y=-2012代入
=(-1)²=1
当x=2011,y=-2012时,
当x=2012,y=-2011时,求代数式(x^4-y^4)/(x²-2xy+y²)·(y-x)/(
当x=√2012 , y=√2011时,代数式（x+y）(x-y)+y²的值是?
matlab 有个关系式y=x,当x>0时,y=0,当x
y=x-1/x+2,当x为什么时 y为无穷大 当x为什么时,y无穷小
当x=2013,y=2014时,代数式(x/y-y/x)÷x-y/x的值为
1、当(x+y)/（x-2y）=3时,2x/y=?
118×1222012²—2013×2011当X=2,Y=1/2时,求代数式（x+y)(x-y)+(x-y)&
当2x-y/x+y=3时,求代数式2x-y/6x-3y的值
指数函数y=3^x当x
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.