5x xy-5y x-xy-y化简
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/17 22:03:46
∵x2+y2-2x-4y+5=0,∴x2-2x+1+y2-4y+4=0,(x-1)2+(y-2)2=0,∴x=1,y=2,∴yx−xy=2-12=1.5;故答案为:1.5.
∵x+y=4,xy=3,∴原式=x2+y2xy=(x+y)2−2xyxy=16−63=103.
没有写错啊(x+1)^2+/y+2/=0平方和绝对值的值恒为非负值只有两数都为0的时候,和才为0所以x+1=0,y+2=0x=-1,y=-2xy=25xy-2/3x^3y^2-4yx+1/2y^2x^
由题得x=-1,y=2代入后式,得结果为-5
=xy-3xy+2xy-xy=-xy
-x^2y+5xy^2-yx^2=-2x^2y+5xy^2
根据分式的基本性质,分子分母都除以xy得,5y+1−5x1y−1−1x=−3×5+1−3−1=72.故选B.
2xy-y+y-xy=xy
(1)原式=3x2-7x+4x-3+2x2=(3+2)x2+(-7+4)x-3=5x2-3x-3;(2)原式=2xy-y+-y-yx=xy;(3)原式=5a2b-15ab2-2a2b+14ab2=(5
xy+yx=10x+y+10y+x=11x+11y=100+x10x=100-11yx=10-1.1y所以y只能是0
∵x-y=4xy,∴2x+3xy-2yx-2xy-y=2(x-y)+3xyx-y-2xy=8xy+3xy4xy-2xy=112.故答案为:112.
yx+xy=x2+y2xy=(x+y)2-2xyxy当x+y=2,xy=-5时,原式=22-2×(-5)-5=-145.故答案为-145.
XY=XZ+YX?那么也就是XY=X(Z+Y)咯,Y=Z+Y?无法证明的.题抄错啦~`
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y=6x^2y-6x^2y+2xy-5yx-3x^2y^2-4y^2x^2-7x=-3xy-7x^2y^2-7x
你抄错题了吧X2+Y2+5/4=2X+Y移项,得(X-1)2+(Y-1/2)2=0X=1,Y=1/2
∵5x2-xy-6y2=0,∴(5x-6y)(x+y)=0,∴5x-6y=0,x+y=0,∴5x=6y,x=-y,∴yx=56或-1.故答案为:56或-1.
令2XY=YX2(10X+Y)=10Y+X解得X/Y=8/19貌似没有这样的两位数啊!至于3位,4位.你的题目没交代清楚啊!
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y|x+3|+(y+1/2)²=0x=-3y=1/2=-3xy-7x