Originally posted by knptmug at 2005-4-20 09:47 PM:- k7 j+ b" { G1 K# _$ |, \$ Q
set small watermelon: x, middle watermelon y and big watermeton z9 X5 j7 j8 b7 M/ ?
) x7 G5 \3 R( p/ utwo simultaneous equations are set up: / D7 m" @7 @+ n! \0.5x+2y+5z=50 (1)$ S5 x1 t$ N# f6 T) d
x+y+z=50 (2)9 O/ y, c2 N: ^# a+ I+ }
Equation(1) means that the total amount paid is equal t ...
% }8 P* m% d0 n+ D& {/ f:lol::lol:" X+ Q$ W* U; U5 x
楼主的标题就是给你写的! 8 L# d) O8 B+ {. B! L n Q& v你看看我们智力超群的同学们回答的都多好啊!