Originally posted by knptmug at 2005-4-20 09:47 PM:' X0 ?$ L2 @ m8 h- T8 U# R* M
set small watermelon: x, middle watermelon y and big watermeton z/ ]: C) h5 ~/ `; C6 A8 c9 A% [+ c a
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two simultaneous equations are set up:3 ~9 |: i$ m! i+ i k5 B9 V
0.5x+2y+5z=50 (1) ' ^- s- m( y5 i& m# P0 fx+y+z=50 (2) 9 X) n; [: D1 T$ X7 h( JEquation(1) means that the total amount paid is equal t ...
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:lol::lol:% t6 |" R! U2 x) |) Y1 f
楼主的标题就是给你写的! $ }) G; }# j5 s2 R; F你看看我们智力超群的同学们回答的都多好啊!