Originally posted by knptmug at 2005-4-20 09:47 PM:- s' u6 h& [+ S p0 T* D2 o5 m
set small watermelon: x, middle watermelon y and big watermeton z% T' r/ r4 Q( a: [& ?- i* `
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two simultaneous equations are set up:. r. t" ~5 ^9 O/ j
0.5x+2y+5z=50 (1)2 n, k) I. {+ B/ ?& ?5 [5 Q; T1 [
x+y+z=50 (2)& h8 N! n( [* a$ ?+ }; b
Equation(1) means that the total amount paid is equal t ...
* i" v; Y6 h/ p) l:lol::lol:, k i2 O0 q3 a- v2 I9 r) Z. z# R
楼主的标题就是给你写的!* O2 R: e2 U: J( b
你看看我们智力超群的同学们回答的都多好啊!