若xy=3,x^2+y^2=10,求x+y与x-y的值

来源：学生作业帮助网编辑：六六作业网时间：2024/07/17 16:35:21

若xy=3,x^2+y^2=10,求x+y与x-y的值若xy=3,x^2+y^2=10,求x+y与x-y的值若xy=3,x^2+y^2=10,求x+y与x-y的值解.﹙x+y﹚=x²+2xy

若xy=3,x^2+y^2=10,求x+y与x-y的值
若xy=3,x^2+y^2=10,求x+y与x-y的值

若xy=3,x^2+y^2=10,求x+y与x-y的值
解.﹙x+y﹚=x²+2xy+y²=16,x+y=±4.
﹙x-y﹚²=x²-2xy+y²=4 x-y=±2

(x+y)^2=x^2+y^2+2xy;
(x-y)^2=x^2+y^2-2xy;
xy=3,那就是xy同正负咯，接下来你自己算咯，不用我算了吧
很多种答案，自己看看呗

若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值若xy=2（x+y),求（3x-5xy+3y)÷(-x+3xy-y) 的值若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值若x^2+xy+y=14,y^2+xy+x=28,求x+y 当x-y=2xy时,求4x-3xy-4y/xy 若xy=-2,x+y=3,求代数式(3xy+10y)+5x- (2xy+2y-3x)的值若xy=-2,x+y=3,求代数式（3xy+10y)+{5x-(2xy+2y-3x)}的值若(3xy+2)^2+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值若(3xy+2)+|7-x-y|=0,求代数式（5xy+10y）-[-5x-（4xy-2y+3x）]的值. 3X^2+XY+Y=15 求XY. 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2 若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy)