若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求：(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较（1）（2）结论,发现规律.

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若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求：(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较（1）（2）结论,发现规律.
若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律
若a/b=c/d=e/f=2/5,求：
(1) (a-c)/(b-d);
(2) (2a+3c-4e)/(2b+3d-4f);
(3)比较（1）（2）结论,发现规律.

若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求：(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较（1）（2）结论,发现规律.
(a-c)/(b-d);=2/5
(2a+3c-4e)/(2b+3d-4f)=2/5
规律：(x1a+x2c+x3e)/(x1b+x2d+x3e)=2/5(x1,x2,x3∈Z)

(a-c)/(b-d);=2/5
(2a+3c-4e)/(2b+3d-4f)=2/5
规律：(x1a+x2c+x3e)/(x1b+x2d+x3e)=2/5(x1,x2,x3∈Z)

若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求 ：(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较（1）（2）结论,发现规律.

若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求：(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较（1）（2）结论,发现规律.