已知x^2+y^2=18,xy=7,求x+y
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/25 18:21:27
已知x^2+y^2=18,xy=7,求x+y已知x^2+y^2=18,xy=7,求x+y已知x^2+y^2=18,xy=7,求x+yx^2+y^2=18x^2+2xy+y^2=18+14=32(x+Y
已知x^2+y^2=18,xy=7,求x+y
已知x^2+y^2=18,xy=7,求x+y
已知x^2+y^2=18,xy=7,求x+y
x^2+y^2=18
x^2+2xy+y^2=18+14=32
(x+Y)²=32
x+y=±4√2
(x+y)^2=x^2+y^2+2xy=18+14=32 x+y=4√2
已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2
已知,x-y=2,xy=7 求x^2 y-xy^2
已知xy^2=-2求xy（2x^3y^7+5x^2y
已知x+y=0,xy=-7,求x^2y+xy^2
已知x+y=2,xy=7求x²y+xy²的值
已知整数x和y,满足x^+xy-2y^=7,求xy的值
已知x=3y,试求（x-y)^2+2xy-y^2/x^2+7xy+y^2
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x*x+xy-2y*y=7 求整数x y的值
已知x^2+y^2=18,xy=7,求x+y
已知X/Y=2/7,求x^2-3XY+2Y^2/X^2-2XY+Y^2
已知x/y=7/2,求2x+3xy+2y/x+2xy+y的值
已知x+y=-5,xy=7,求x^2y+xy^2-x-y的值
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
已知1/x-1/y=5,求分式y+xy-x/2x+7xy-2y的值.
已知1/x-1/y=5 求分式-x+xy+y/2x+7xy-2y
已知1/X-1/y=5,求分式(y+xy-x)/(2x+7xy-2y)的值