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已知x平方+y平方+xy%3y+3=0.求x的y次方的值

2016-03-13 已知x²+y²+xy-3y+3=0,求x... 4 2014-08-27 x平方+y平方+xy-3y+3=0,求xy次方的值。 3 更多类似...

拆项、配方: (X^2+XY+1/4Y^2)+3(1/4Y^2-Y+1)=0, ((X+1/2Y)^2+3(1/2Y-1)^2=0, {X+1/2Y=0, {1/2Y-1=0, 解得:X=-1,Y=2, X^Y=(-1)^2=1。

x²+y²+xy-3y+3=0 x²+xy+y²/4 +3y²/4-3y+3=0 (x+y/2)²+3/4(y-2)²=0 ∴x+y/2=0 y-2=0 ∴x=-1 y=2 ∴x的y次方=(-1)²=1 希望对你有所帮助 还望采纳~~

x2+y2+xy-3y+3=0 (x2+xy+1/4*y2)+(3/4*y2-3y+3)=0 (x+y)^2+3(1/2y-1)^2=0 x+y=0 1/2y-1=0 y=2 x=-2 x^y=4

x^2+y^2+xy-3y+3=0 (x + (1/2)y )^2 + (3/4)y^2 - 3y +3 =0 (x + (1/2)y )^2 + (3/4)( y^2 - 4y +4) =0 (x + (1/2)y )^2 + (3/4)( y -2)^2 =0 x+(1/2)y = 0 and y=2 x= -1 and y=2 x^y =(-1)^2 =1

解: x²+y²+xy-3y+3=0 4x²+4y²+4xy-12y+12=0 (4x²+4xy+y²)+(3y²-12y+12)=0 (2x+y)²+3(y²-4y+4)=0 (2x+y)²+3(y-2)²=0 平方项恒非负,乘以正数后仍恒非负,两非负项之和等于0,两非负项均...

x^2-xy=-32xy-y^2=-82x^2+4xy-3y^2=2x^2-2xy+6xy-3y^2=2(x^2-xy)+3(2xy-y^2)=2×(-3)+3×(-8)=-30

解:已知x/y=2/3,得x=2/3y, 则(x的2次方-3xy+2y的2次方)/(2x的2次方+3xy-5y的2次方) =[(x-2y)×(x-y)]/[(2x+5y)×(x-y)] =(x-2y)/(2x+5y) =(2/3y-2y)/(2×2/3y+5y) =(-4/3y)/(4/3y+15/3y) =(-4/3y)/(19/3y) =-4/19

3+3y'-3(y-x*y')=03+3y'-3y+3xy'=0y'=(3y-3x²)/(3y²-3x)

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