Originally posted by knptmug at 2005-4-20 09:47 PM:2 y" u+ I$ y( h' t
set small watermelon: x, middle watermelon y and big watermeton z 5 U$ Q4 W1 r1 ^7 q2 ^: T, e7 t8 C 3 j* X4 N) q) G% L# ptwo simultaneous equations are set up: & z' F" C0 q+ [4 v# P' T' q. }0.5x+2y+5z=50 (1)- Y' e" _& X4 T! B% j |! \) T
x+y+z=50 (2); c/ S& J: A% W# l
Equation(1) means that the total amount paid is equal t ...
; @/ O+ a/ P4 V8 D3 R& X1 l
:lol::lol:3 X% e$ `0 @- h0 R6 P/ |! a
楼主的标题就是给你写的!/ X% E" P: p. ^4 P7 F
你看看我们智力超群的同学们回答的都多好啊!