Originally posted by knptmug at 2005-4-20 09:47 PM:. ^; k6 u6 E; r0 F/ F
set small watermelon: x, middle watermelon y and big watermeton z $ p9 O8 m: \% V% E 2 d' b* v$ {5 J/ @/ e( X2 O7 Ctwo simultaneous equations are set up: 1 W7 t! ]" d4 p ]$ G! F0 ]% M) H0.5x+2y+5z=50 (1) ( w. }% C. g$ e( o, E Z* y1 U* Cx+y+z=50 (2) . Y+ w: ~9 }# z! FEquation(1) means that the total amount paid is equal t ...
7 S3 v N9 }$ E, ^: Z4 G" N& y# \0 C) W:lol::lol: - H1 Z' }" F) }& A楼主的标题就是给你写的!# @) B% A c- ]$ J) X* Q5 g
你看看我们智力超群的同学们回答的都多好啊!