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Help! To junior high school mathematics "algebraic evaluation" topic! ! ! ! Ask a friend for help! ! Wait online! ! Urgent, urgent, urgent! !
ab=2(a+b)，bc=3(b+c)，ca=4(c+a)，

(a+b)/(ab)= 1/2，(b+c)/(bc)= 1/3，(c+a)/(ca)= 1/4

1/a+ 1/b= 1/2

1/b+ 1/c= 1/3

1/c+ 1/a= 1/4

Add 3 formulas to get:

1/a+ 1/b+ 1/c = 13/24

1/a=5/24，a=24/5

1/b=7/24，b=24/7

1/c= 1/24，c=24

(a- 1)(b- 1)(c- 1)

=( 19/5)( 17/7)(23)

=7429/35

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