Originally posted by knptmug at 2005-4-20 09:47 PM:5 H, D: S! m4 A/ V |( X
set small watermelon: x, middle watermelon y and big watermeton z/ o5 F# p; K" F! N9 a; ^
6 s( [# }3 j* W$ R- Ctwo simultaneous equations are set up:4 M. v6 I; D- C! A9 R9 H6 Z
0.5x+2y+5z=50 (1) 2 U# q. O/ j% K" b" m& Q) Rx+y+z=50 (2) 8 c- Z% O- X1 U2 L5 eEquation(1) means that the total amount paid is equal t ...
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:lol::lol:' o+ o( Q! v) @( d
楼主的标题就是给你写的!" C% Y0 W- [- ^$ o( k: B2 u m/ z
你看看我们智力超群的同学们回答的都多好啊!