Originally posted by knptmug at 2005-4-20 09:47 PM: - }1 u5 k: N ^# K' T& q! y! Xset small watermelon: x, middle watermelon y and big watermeton z: ~ }; N! O" D; {9 z. f
% a; ?2 p; V) R& {two simultaneous equations are set up:4 t; q) s3 [) n2 m6 m+ T
0.5x+2y+5z=50 (1)& J+ R0 u H G* E" |; b' A8 c
x+y+z=50 (2) : F% @' ~' K: P* R" ]( F/ ]1 OEquation(1) means that the total amount paid is equal t ...
; O" A' O. A7 x. c
:lol::lol: ) i& T6 f0 Z" B) ~% b" w楼主的标题就是给你写的! * m- k% l$ \& G" k" I( h你看看我们智力超群的同学们回答的都多好啊!