Originally posted by knptmug at 2005-4-20 09:47 PM: * w1 k* j T# kset small watermelon: x, middle watermelon y and big watermeton z 8 ~3 K( W' F2 M9 n% r( ^' O5 M/ f. F* v) ~5 d3 @" k) ~4 ^
two simultaneous equations are set up: + r2 N8 M5 G Q* j" K0.5x+2y+5z=50 (1)% P* {& @1 h+ L
x+y+z=50 (2)& Q" a+ v4 \7 i" G6 w, }3 Z8 }5 C( K
Equation(1) means that the total amount paid is equal t ...
- ]: T. M8 b7 q:lol::lol: ( U% ^2 w6 ~; f( ^7 [楼主的标题就是给你写的!0 w( t+ H q2 y( Z
你看看我们智力超群的同学们回答的都多好啊!