约分:(x²-y²-9-2xy)/(x²-y²+6x+9)已知(1)/(x) -
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约分:
(x²-y²-9-2xy)/(x²-y²+6x+9)
已知(1)/(x) - (1)/(y)=2,求(3x+xy-3y)/(y-xy-x)的值
(x²-y²-9-2xy)/(x²-y²+6x+9)
已知(1)/(x) - (1)/(y)=2,求(3x+xy-3y)/(y-xy-x)的值
(x²-y²-9-2xy)/(x²-y²+6x+9)
错了
(x²+y²-9-2xy)/(x²-y²+6x+9)
=[(x-y)²-9]/[(x+3)²-y²]
=(x-y+3)(x-y-3)/[(x+y-3)(x-y-3)]
=(x-y+3)/(x+y-3)
已知(1)/(x) - (1)/(y)=2,求(3x+xy-3y)/(y-xy-x)的值
1/x-1/y=(y-x)/xy=2
y-x=2xy
x-y=-2xy
原式=[3(x-y)+xy]/[(y-x)-xy]
=(-6xy+xy)/(2xy-xy)
=-5xy/xy
=-5
错了
(x²+y²-9-2xy)/(x²-y²+6x+9)
=[(x-y)²-9]/[(x+3)²-y²]
=(x-y+3)(x-y-3)/[(x+y-3)(x-y-3)]
=(x-y+3)/(x+y-3)
已知(1)/(x) - (1)/(y)=2,求(3x+xy-3y)/(y-xy-x)的值
1/x-1/y=(y-x)/xy=2
y-x=2xy
x-y=-2xy
原式=[3(x-y)+xy]/[(y-x)-xy]
=(-6xy+xy)/(2xy-xy)
=-5xy/xy
=-5
(3x-2y)²(3x-2y)²(9x²+4y²)²
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(x+y)²-2(x²-y²)+(y-x)²
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