Originally posted by knptmug at 2005-4-20 09:47 PM:+ C; p; s0 G9 b$ m0 M2 U" {+ f' x: v
set small watermelon: x, middle watermelon y and big watermeton z8 u5 c! h: v2 f! ]6 F4 c2 h
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two simultaneous equations are set up:8 l+ l6 f" V8 I% O4 h0 g
0.5x+2y+5z=50 (1)! t8 ^1 H& z$ K8 M
x+y+z=50 (2) ; _ @' j# G- C a* u+ m7 @Equation(1) means that the total amount paid is equal t ...
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:lol::lol:! T( \* E' a1 A/ g; S2 A k7 f; ?
楼主的标题就是给你写的!2 j5 b' o$ Z: j; M) W, _5 d! q. e3 Y
你看看我们智力超群的同学们回答的都多好啊!