Originally posted by knptmug at 2005-4-20 09:47 PM:' W% Q. t% W1 B' {+ ^) W
set small watermelon: x, middle watermelon y and big watermeton z , k- o' u: a/ h" q. u7 \7 s# R . R7 _! i \! s# W; stwo simultaneous equations are set up:7 p# J/ S- B; w, S3 I
0.5x+2y+5z=50 (1) 7 }" m; A" i8 R! P: fx+y+z=50 (2) % r/ b, Z$ s# LEquation(1) means that the total amount paid is equal t ...
7 n4 ~1 P2 e8 U" u i:lol::lol: 0 _! U% y& o2 L3 M8 X; p% j( n楼主的标题就是给你写的!+ Z3 G. i) u& S# T a4 H4 h" a
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