1.化简分式2X三次方-8X/X+2的结果是( )A.2X/X+2 B.X²-4 C.X²-4/X+2 D.2X²-4X2.如果b/a+a/b=2,则a²+ab+b²/a²-4ab+b²的值等於( )A.1 B.-1 C.3/2 D.- 3/23.已知a²+1/a=3,则a²+1/a²=___4.已
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1.化简分式2X三次方-8X/X+2的结果是( )A.2X/X+2 B.X²-4 C.X²-4/X+2 D.2X²-4X2.如果b/a+a/b=2,则a²+ab+b²/a²-4ab+b²的值等於( )A.1 B.-1 C.3/2 D.- 3/23.已知a²+1/a=3,则a²+1/a²=___4.已
1.化简分式2X三次方-8X/X+2的结果是( )
A.2X/X+2 B.X²-4 C.X²-4/X+2 D.2X²-4X
2.如果b/a+a/b=2,则a²+ab+b²/a²-4ab+b²的值等於( )
A.1 B.-1 C.3/2 D.- 3/2
3.已知a²+1/a=3,则a²+1/a²=___
4.已知A=3X/X+1,B=2/(X²-1) +3,当X=___时,A与B的值相等.
5.如果X=2009,Y=2010,那麼(X+Y)*X²-2XY+Y²/X²-Y²=____
6.已知a²+2ab+b²-4b+5=0,计算(a/b - b/a)÷a+b /a的结果为___
7.如果3X=2Y,则X/ X-Y - Y/ X+Y +Y²/ X²-Y²的值为____
8.已知a/(X+1) - b/(X+2) =2X+1/(X-1)(X+2),求a,b的值(要求写出计算过程)
1.化简分式2X三次方-8X/X+2的结果是( )A.2X/X+2 B.X²-4 C.X²-4/X+2 D.2X²-4X2.如果b/a+a/b=2,则a²+ab+b²/a²-4ab+b²的值等於( )A.1 B.-1 C.3/2 D.- 3/23.已知a²+1/a=3,则a²+1/a²=___4.已
1.化简分式2X三次方-8X/X+2的结果是( D )
A.2X/X+2 B.X2-4 C.X2-4/X+2 D.2X2-4X
2.如果b/a+a/b=2,则a2+ab+b2/a2-4ab+b2的值等於( D )
A.1 B.-1 C.3/2 D.- 3/2
3.已知a2+1/a=3,则a2+1/a2=__7_
4.已知A=3X/X+1,B=2/(X2-1) +3,当X=_1/3_时,A与B的值相等.
5.如果X=2009,Y=2010,那麼(X+Y)*X2-2XY+Y2/X2-Y2=__-1__
6.已知a2+2ab+b2-4b+5=0,计算(a/b - b/a)÷a+b /a的结果为__-3/2_
7.如果3X=2Y,则X/ X-Y - Y/ X+Y +Y2/ X2-Y2的值为_-22/5___
8.已知a/(X+1) - b/(X+2) =2X+1/(X-1)(X+2),求a,b的值(要求写出计算过程)
a/(x-1)-b/(x+2)=[(x-1)+(x+2)]/(x-1)(x+2)
a/(x-1)-b/(x+2)=1/(x-1)+1/(x+2)
(a-1)/(x-1)=(b+1)/(x+2)
x值是变化的,要此式恒成立
a-1=b+1=0
a=1,b=-1