 鲜花( 634)  鸡蛋( 5)
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Originally posted by knptmug at 2005-4-20 09:47 PM:/ A' ^$ X( {9 X& \/ Z
set small watermelon: x, middle watermelon y and big watermeton z9 y0 u2 o2 M3 A& U2 f: Q) h
- ^1 L$ B3 F; t, T/ f7 c! \ ?
two simultaneous equations are set up:
, @3 A$ g: j0 ^( o7 X0.5x+2y+5z=50 (1)
1 B4 U- ~% [ l: {4 b. J8 Fx+y+z=50 (2)
4 C8 u ^" f, J: L# CEquation(1) means that the total amount paid is equal t ...
. ~$ x4 p) m, ]:lol::lol:8 M) _6 `- `8 ?& t' E" m
楼主的标题就是给你写的!$ A- Q4 h1 E+ `7 E8 p$ Y
你看看我们智力超群的同学们回答的都多好啊! |
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