太简单了吧?# `% f2 J4 j- j8 T3 M! b
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小西瓜1元2个, 一个就是5毛,50个就是 5*50, 五五三十五,三十五块买了50各西瓜, 15块小费。0 m* |8 P' \, d4 A# N) k/ m1 H' F& w
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下一个问题,这50个西瓜怎么分?
Originally posted by knptmug at 2005-4-20 09:47 PM:: D8 L9 \% Z, Q/ _
set small watermelon: x, middle watermelon y and big watermeton z + i- {& p) |+ W 9 n( w; r- f6 I- _2 D6 atwo simultaneous equations are set up:8 X' @2 P3 ]) f5 h [3 e1 b6 G
0.5x+2y+5z=50 (1) 0 u! M$ p* ^$ b m+ Q9 U: u8 bx+y+z=50 (2)0 i( E7 [% r a+ x% ]5 L7 r
Equation(1) means that the total amount paid is equal t ...