约分，要过程
（1）m^2-2m+1/1-m(2）1-4b^4/2b^3+b(3)1-x^2/x^2-3x-4(4)x^2+4xy+4y2-9/2x+4y-6...
（1）m^2-2m+1/1-m (2）1-4b^4/2b^3+b (3)1-x^2/x^2-3x-4
(4)x^2+4xy+4y2-9/2x+4y-6 展开
(4)x^2+4xy+4y2-9/2x+4y-6 展开
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你好，很高兴回答你的问题
（1）m^2-2m+1/1-m
=(m-1)^2/1-m
=1-m
(2）1-4b^4/2b^3+b
=1-4b^4/b(2b^2+1)
=(1+2b^2)(1-2b^2)/(2b^2+1)
=1-2b^2
(3)1-x^2/x^2-3x-4
=1-x^2/(x-4)(x+1)
=(1-x)(1+x)/(x-4)(x+1)
=1-x/x-4
(4)x^2+4xy+4y2-9/2x+4y-6
=(x+2y+3)(x+2y-3)/2(x+2y-3)
=x+2y+3/2
（1）m^2-2m+1/1-m
=(m-1)^2/1-m
=1-m
(2）1-4b^4/2b^3+b
=1-4b^4/b(2b^2+1)
=(1+2b^2)(1-2b^2)/(2b^2+1)
=1-2b^2
(3)1-x^2/x^2-3x-4
=1-x^2/(x-4)(x+1)
=(1-x)(1+x)/(x-4)(x+1)
=1-x/x-4
(4)x^2+4xy+4y2-9/2x+4y-6
=(x+2y+3)(x+2y-3)/2(x+2y-3)
=x+2y+3/2
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