Originally posted by knptmug at 2005-4-20 09:47 PM: 9 ?4 x& I. c# u4 g8 L' {7 Pset small watermelon: x, middle watermelon y and big watermeton z+ n+ ?7 K+ `8 V( T( B
' x4 E0 h0 |0 ^: g4 K, ^8 ^( `0 Y, Ttwo simultaneous equations are set up: % v5 J; | z. @. f( `+ [0.5x+2y+5z=50 (1): r* ^- {7 l4 D2 u8 k) V
x+y+z=50 (2)$ ?3 r w& @; K4 |+ |2 C
Equation(1) means that the total amount paid is equal t ...
: y) |+ b; ]% N# R3 @7 V
:lol::lol: 2 p- x! u. P9 h8 P3 V3 z+ B楼主的标题就是给你写的!' b L+ o: m* \3 ~% e7 G
你看看我们智力超群的同学们回答的都多好啊!