 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:1 w# Y/ ]3 y0 Q8 B6 y
set small watermelon: x, middle watermelon y and big watermeton z
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two simultaneous equations are set up:( W- N$ t+ C& U! D% a
0.5x+2y+5z=50 (1)1 f- j" a4 I) l4 _: `' z
x+y+z=50 (2)
$ `6 g3 p2 N ]1 b0 L. ^Equation(1) means that the total amount paid is equal t ... % a& [( D: g7 B7 K J
:lol::lol:
5 q, ]! d% D% V5 A0 o8 f( p+ ]楼主的标题就是给你写的!
/ t: D, ^5 B1 |4 ~ h' o' A你看看我们智力超群的同学们回答的都多好啊! |
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