已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 16:24:12
已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确
已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少
格式正确
已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确
X2+xy-(xy+y2)=4-12
x2+xy-xy-y2=-8
x2-y2=-8
x2+xy+xy+y2=4+12
x2+2xy+y2=16
x^2+xy=4----(1)
xy+y^2=12----(2)
(1)-(2)
(x^2+xy)-(xy+y^2)=4-12
x^2-y^2=-8
(1)+(2)
(x^2+xy)+(xy+y^2)=4+12
x^2+2xy+y^2=16
x2+xy=4 xy+y2=12
两式相加为 (x2+xy=4)+(xy+y2=12)=x2+2xy+y2=16
两式相减为 (x2+xy=4)-(xy+y2=12)=x2-y2=-8
已知x2+xy=4,xy+y2=12,求代数式x2-y2与x2+2xy+y2的值各为多少格式正确
已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2.
已知x2+y2 =7,xy=-2.求5x2 -3xy-4y2 -11xy-7x2 +2y2
已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
已知x2+y2+4x-2y+5=0,求x2+2xy+y2值
已知x/y+y/x=2,求(x2+xy+y2)/(x2-4xy+y2)的值
已知x+y=5,xy=-12,求代数式x2-xy+y2
已知x+y=4,xy=2,求x2+y2+3xy的值.
已知x满足2x2+4x+y2=2xy-4 求:xy
已知:x2+y2=4xy,求(x4+y4)÷(xy)2
已知:x2+y2=7,xy=-2.求7x2-3xy-2y2-11xy-5x2+4y2已知:x2+y2=7,xy=-2.求7x2-3xy-2y2-11xy-5x2+4y2
解方程组x2+xy=12 xy+y2=4
已知x2+y2=12,x+y=4,求xy的值
已知x-y=4,x2+y2=12,求xy的值
已知X2次方+XY=3,XY+Y2次方=-2,求下例值:X2次方+4XY+3Y2次方
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2=
x2-y2=xy,xy不等于0求x2/y2=y2/x2