若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/26 09:16:22
若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.x^2+
若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.
若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.
若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.
x^2+xy+y=14,y^2+xy+x=28
两式相加得
x²+2xy+y²+(x+y)=42
(x+y)²+(x+y)-42=0
(x+y+7)(x+y-6)=0
所以x+y+7=0或x+y-6=0
即x+y=-7或x+y=6
x^2+xy+y=14 ①
y^2+xy+x=28 ②
①+②得,x^2+xy+y+y^2+xy+x=42
(x^2+2xy+y^2)+(x+y)=42
(x+y)^2+(x+y+1)=42
(x+y)(x+y+1)=42
因为42=6*7=(-6)*(-7)
所以x+y=6或-7
X+Y=6或7
两式子相加
可得(X+Y)^2+(X+Y)-42=0
因式分解得
(X+Y-6)(X+Y+7)=0
X+Y=6或7
肺病
若x^2+xy+y=14,y^2+xy+x=28,求x+y
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
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
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x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若xy/x+y=2,则3x-xy+3y/-x+3xy-y=
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-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y=
若x^2+xy+y=14,y^2+xy+x=28,求x+y的值.
x^2-xy/xy-y^2约分
若2x+y=0,求(x^2+xy+y^2)/(2xy-x^2)
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=