Originally posted by knptmug at 2005-4-20 09:47 PM:- `8 @2 A) \7 c w+ ^
set small watermelon: x, middle watermelon y and big watermeton z + W" W8 B `1 H1 d" h4 m5 r. b z3 H' L7 n. u
two simultaneous equations are set up:* B$ N' |! f2 z3 x a
0.5x+2y+5z=50 (1)% F' b5 j8 q; Z, a" T. O. V: I, |
x+y+z=50 (2)& V2 H. R" \- N& U# ~
Equation(1) means that the total amount paid is equal t ...
! U2 t) K' g7 D5 P+ x:lol::lol:# S+ X6 H# v- c3 r& M
楼主的标题就是给你写的!% R7 L% u0 m5 s( X# k/ M; f
你看看我们智力超群的同学们回答的都多好啊!