Originally posted by knptmug at 2005-4-20 09:47 PM: & f! C6 b9 o% U: D8 Y+ T8 N# Sset small watermelon: x, middle watermelon y and big watermeton z & l: b& |2 C5 n) q! M - M4 n* U" b: W( y& Ftwo simultaneous equations are set up: 0 N W! A8 ~2 H$ Y+ U$ P8 [1 O0.5x+2y+5z=50 (1)4 ?) `- k$ o9 _& _! m6 T
x+y+z=50 (2) o2 P4 b2 l& I4 w+ f! V
Equation(1) means that the total amount paid is equal t ...
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楼主的标题就是给你写的! 3 v \% ]) d' G6 r" c, M你看看我们智力超群的同学们回答的都多好啊!