Originally posted by knptmug at 2005-4-20 09:47 PM:, c6 m2 m9 R% Y$ e# ?3 u& ?1 U- [
set small watermelon: x, middle watermelon y and big watermeton z+ q. A2 t, w% y* I
. X' W# \5 K1 V/ V4 `" }, J- p) ktwo simultaneous equations are set up: 1 w9 i9 a8 H6 x6 M2 q0.5x+2y+5z=50 (1)* |' Y( [% U$ `" q2 n
x+y+z=50 (2)) K" J6 W# @) Y' X
Equation(1) means that the total amount paid is equal t ...
# K8 C' ~% [ {8 \
:lol::lol: 9 k* K3 @ j$ q3 z- q! x楼主的标题就是给你写的!. K3 G4 b) Y. r& I
你看看我们智力超群的同学们回答的都多好啊!