1 2x/4x2 4x 1=1/(2x 1)
x xy/y2-1=x(y 1)/[(y 1)(y-1)]=x/(y-1)
4x-x2/16-x2=x(4-x)/[(4 x)(4-x)]=x/(4 x)
x2-y2/3x2 6xy 3y2=(x y)(x-y)/[3(x y)2]=(x-y)/[3(x y)]
1-4x2/2x3 x=(1-2x)(1 2x)/x(2x2 1)
x2y-2xy y/y-x2y=y(1-x)2/[y(1 x)(1-x)]=(1-x)/(1 x)
a2-3ab/a2-6ab 9b2=a(a-3b)/(a-3b)2=a/(a-3b)

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希望采纳

(1)   5x / 25x^2

=5x/5X(5X)

=1/5X

 

(2)  9ab^2+6abc / 3a^2b

=3ab(3b+2c)/3ab(a)

=3b+2c/a

 

(3)  9a^2+6ab+b^2 / 3a+b

=(3a+b)^2/3a+b

=3a+b

 

(4)x^2-36 / 2x+12 

=(x+6)(x-6)/2(x+6)

=x-6/2      

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