Originally posted by knptmug at 2005-4-20 09:47 PM:! I5 H1 A& }) g0 y
set small watermelon: x, middle watermelon y and big watermeton z ; K; {% k1 A" a' ~* d& ? $ R/ f+ S/ I0 Ltwo simultaneous equations are set up:5 E8 @( k- x# L; H
0.5x+2y+5z=50 (1) 0 I+ Q- B) T [# G4 {/ t0 T( Gx+y+z=50 (2) & k7 z. E. u' s3 v" ?Equation(1) means that the total amount paid is equal t ...
/ W% i+ k( j3 x
:lol::lol:7 n8 ~) n2 ~! F6 X, |; h
楼主的标题就是给你写的!( l. ~: b$ c/ R# f
你看看我们智力超群的同学们回答的都多好啊!