Originally posted by knptmug at 2005-4-20 09:47 PM:6 T/ C @- q. h7 h* j/ L9 O
set small watermelon: x, middle watermelon y and big watermeton z' i" j- ?* M% S7 U
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two simultaneous equations are set up: / F, C9 ?' ?# [% r( M! |! {0.5x+2y+5z=50 (1) 9 r6 f( v4 i, P" M3 \x+y+z=50 (2) 5 F& P1 e: D$ U9 R+ c, bEquation(1) means that the total amount paid is equal t ...
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:lol::lol:! p! C* O0 |9 m8 K
楼主的标题就是给你写的!( c9 M- I) ~# h9 S
你看看我们智力超群的同学们回答的都多好啊!