Originally posted by knptmug at 2005-4-20 09:47 PM:$ g6 R! X s* c( }
set small watermelon: x, middle watermelon y and big watermeton z 3 Y% z0 a. o. B+ t/ I ; ^% u/ Z! X) Ptwo simultaneous equations are set up: + Y' A9 @( Q# U2 T. D0.5x+2y+5z=50 (1)/ }% ?4 Y7 W' [+ M- `7 L
x+y+z=50 (2) 0 _! F0 Z; I& I, Z% e5 VEquation(1) means that the total amount paid is equal t ...
# O: x: X3 N- ]/ F' ^' Q:lol::lol:! l4 V0 m/ l2 E
楼主的标题就是给你写的!7 k$ E% c7 |$ \, t: Z+ H! o# w7 C
你看看我们智力超群的同学们回答的都多好啊!