Originally posted by knptmug at 2005-4-20 09:47 PM:* ^' g6 T* @' f" p4 X" N
set small watermelon: x, middle watermelon y and big watermeton z 6 R" c" R( F M* J7 ? 6 K+ b& J5 r# u: {two simultaneous equations are set up: 0 V: {5 ~0 v- P g" U' c0.5x+2y+5z=50 (1) / {+ v3 K8 f: f7 X% W0 ex+y+z=50 (2)' p6 V" B% ^! s/ H% Y2 g8 B2 _
Equation(1) means that the total amount paid is equal t ...
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:lol::lol:7 C+ l; X! l" z/ I b* Z
楼主的标题就是给你写的! 3 U7 K5 A1 B1 S8 ?) A' U8 t你看看我们智力超群的同学们回答的都多好啊!