1、约分(1)-4x²y/8xy² (2)2(x-y)²/6(y-x)² (3)a²-4a+4/a²-4 (4)x三次-2x²y/x²y-2xy²2、用分式表示下列各式的商,并约分(1)-4m三次n²/(2m三次nl) (2)(

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1、约分(1)-4x²y/8xy² (2)2(x-y)²/6(y-x)² (3)a²-4a+4/a²-4 (4)x三次-2x²y/x²y-2xy²2、用分式表示下列各式的商,并约分(1)-4m三次n²/(2m三次nl) (2)(
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1、约分(1)-4x²y/8xy² (2)2(x-y)²/6(y-x)² (3)a²-4a+4/a²-4 (4)x三次-2x²y/x²y-2xy²2、用分式表示下列各式的商,并约分(1)-4m三次n²/(2m三次nl) (2)(
1、约分
(1)-4x²y/8xy² (2)2(x-y)²/6(y-x)² (3)a²-4a+4/a²-4 (4)x三次-2x²y/x²y-2xy²
2、用分式表示下列各式的商,并约分
(1)-4m三次n²/(2m三次nl) (2)(x²-9)/(-2x²+6x)

1、约分(1)-4x²y/8xy² (2)2(x-y)²/6(y-x)² (3)a²-4a+4/a²-4 (4)x三次-2x²y/x²y-2xy²2、用分式表示下列各式的商,并约分(1)-4m三次n²/(2m三次nl) (2)(
1、约分
(1)-4x²y/8xy² =-x/2y
 (2)2(x-y)²/6(y-x)² =1/3
 (3)a²-4a+4/a²-4 =(a-2)²/(a-2)(a+2)  = (a-2)/(a+2)
 (4)x三次-2x²y/x²y-2xy²  =  x²(x-2y)/xy(x-2y)=x/y
2、用分式表示下列各式的商,并约分
(1)-4m三次n²/(2m三次nl)
       =-2n
 (2)(x²-9)/(-2x²+6x)
           =(x-3)(x+3)/(-2x)(x-3)
           =(x+3)/(-2x)

1、约分
(1)-4x²y/8xy² =-x/2y
(2)2(x-y)²/6(y-x)² =1/3
(3)a²-4a+4/a²-4=(a-2)/(a+2)
(4)x三次-2x²y/x²y-2xy²=x/y

2、用分式表示下列各式的商,并约分
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1、约分
(1)-4x²y/8xy² =-x/2y
(2)2(x-y)²/6(y-x)² =1/3
(3)a²-4a+4/a²-4=(a-2)/(a+2)
(4)x三次-2x²y/x²y-2xy²=x/y

2、用分式表示下列各式的商,并约分
(1)-4m三次n²/(2m三次nl) =-4m³n²/2m³n=-2n
(2)(x²-9)/(-2x²+6x)=(x²-9)/-2x(x+3)=-(x+3)/2x

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(1)-4x²y/8xy²=-x/2y
(2) 2(x-y)²/6(y-x)²=2[-(y-x)]²/6(y-x)²=1/3
(3) a²-4a+4/a²-4=(a-2)²/(a-2)(a+2)=(a-2)/(a+2)
(4) ?