Originally posted by knptmug at 2005-4-20 09:47 PM:3 v+ q- i" d0 S( o9 c( j$ F
set small watermelon: x, middle watermelon y and big watermeton z 8 H v, f% i! R6 V: ] o; P* z! C 3 _9 _3 T7 ^* [" f4 }5 |two simultaneous equations are set up:5 [1 J0 @, M K5 D3 r0 q' R
0.5x+2y+5z=50 (1)6 O" G. Z( a0 m- N( ~9 M
x+y+z=50 (2): P l# b' {2 Q; \* F
Equation(1) means that the total amount paid is equal t ...
. L. Y6 H+ v$ c
:lol::lol:* F' O j4 ?9 _7 J. V
楼主的标题就是给你写的! 9 K3 T, F! e- t4 N! S! p6 y你看看我们智力超群的同学们回答的都多好啊!