Originally posted by knptmug at 2005-4-20 09:47 PM: : m" q" V& \. Z$ f2 o9 D/ Qset small watermelon: x, middle watermelon y and big watermeton z + ^# ?5 {) x% D& k% B: @2 v4 Z+ I- ~ ' ^1 x Y( I) N R) w" ?- G y2 T8 f& Ptwo simultaneous equations are set up:; m+ K7 R2 |6 m6 ~9 w- w
0.5x+2y+5z=50 (1)' R; d9 c# [2 |: \2 V# q! `
x+y+z=50 (2)- q( Y* _! O* \: k+ O
Equation(1) means that the total amount paid is equal t ...
5 a9 g# a$ H e' F. m
:lol::lol:- ~2 a% q; a6 s1 ?! G5 G
楼主的标题就是给你写的! : k& A: A. c& [. H* g# H/ a/ y你看看我们智力超群的同学们回答的都多好啊!