Originally posted by knptmug at 2005-4-20 09:47 PM:3 }4 b1 _1 ?9 J5 `( Y
set small watermelon: x, middle watermelon y and big watermeton z ) R X' ?" d5 A7 w ! }! U) P' B+ Ntwo simultaneous equations are set up:/ W4 {) J# [. _6 l6 G) a: J: B
0.5x+2y+5z=50 (1)4 f) |( n( Q ~* b* L
x+y+z=50 (2) 3 ~/ [8 F5 b: i! QEquation(1) means that the total amount paid is equal t ...
0 C2 y' c- v" z5 k/ p( e# E:lol::lol:* O: ], c) Z4 K, G$ ^: c0 F
楼主的标题就是给你写的!5 Z r2 _) n8 C+ I
你看看我们智力超群的同学们回答的都多好啊!