若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 22:22:24
若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?(x-y)^2
若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?
若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?
若x+y=5,xy=-11,则(x-y)2=?,x3+y3=?
(x-y)^2
=x^2+y^2-2xy
=(x^2+y^2+2xy)-4xy
=(x+y)^2-4xy
=5^2-4*(-11)
=25+44
=69
x^3+y^3
=(x+y)(x^2+y^2-xy)
=(x+y)[(x+y)^2-3xy]
=5*[5^2-3*(-11)]
=5*58
=290
(x-y)²=(x+y)²-4xy=25+4×11=69.
x³+y³=(x+y)(x²+y²-xy)=(x+y)[(x-y)²+xy]=5×(69-11)=290.
(x-y)2=(x+y)²-4xy=25+44=69
x3+y3=(x+y)(x²-xy+y²)=(x+y)[(x+y)²-3xy]=5(25+33)=290
(x-y)2=25+44=69
x3+y3=290
(x-y)2=(x+y)2-4xy= 25+44=69,(x+y)3=x3+y3+3xy(x+y) 可得x3+y3=(x+y)3-3xy(x+y)=270
x+y=5,xy=-11,
则 (x-y)^2=x^2+y^2-2xy
=(x^2+y^2+2xy)-4xy
=(x+y)^2-4xy=5^2-4*(-11)=25+44=69
x^3+y^3
=(x+y)(x^2+y^2-xy)=(x+y)[(x+y)^2-3xy]
=5*[5^2-3*(-11)]=5*58=290
若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
|x|/x+y/|y|+xy/|xy|=
若7x-11xy+4y²=0,且xy≠0,则y/x=若(x²+y²+2)(x²+y²-5)-8=0,则x²+y²=
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若|x-3|+(y+2)²=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若 x+y=5,xy=-50 则x^2y+xy^2 =( )
若x+y=3,xy=-2 ,则2xy-(x+y)=
若x-y=1,xy=5,则x^2y-xy^2=
已知(X+Y-3)²+|5+XY|=0,则X-XY+Y
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
若X分之一减y分之一=3,求(5x+2xy-5y)/(x-4xy-y)
若1/x-1/y=2,则(3x+xy-3y)/(x-xy-y)的值为?
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
若正数x,y满足x-y=5,xy=11/4,则x+y=_____
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值