Originally posted by knptmug at 2005-4-20 09:47 PM: / o0 b4 q- b7 W% l, u$ j# Fset small watermelon: x, middle watermelon y and big watermeton z s: {# ^% E# N" d+ W, k$ X3 X' f; _; g) |) J. N8 V
two simultaneous equations are set up:4 G) u9 c; v8 |; ~
0.5x+2y+5z=50 (1) 2 s! e- \. t/ r ~; y8 ix+y+z=50 (2)3 k& s% {3 T: ]/ h1 S4 K) [
Equation(1) means that the total amount paid is equal t ...
Y! b& S$ a) D! f; e' d:lol::lol: 4 w+ B0 |4 {/ `& V# V楼主的标题就是给你写的! ) r/ X {; j; {& ~4 O. l9 J你看看我们智力超群的同学们回答的都多好啊!