Originally posted by knptmug at 2005-4-20 09:47 PM:; g4 o& Z3 e! |+ f5 F4 l0 D2 k
set small watermelon: x, middle watermelon y and big watermeton z . d6 E2 ?0 f3 {0 j6 V. i: c! {& P. Z D* w8 ~* U. P- c9 V
two simultaneous equations are set up:6 Q2 P- v6 v0 @1 o2 |+ k) ~' L
0.5x+2y+5z=50 (1)2 O7 s8 h' X3 o' c' `( _$ Z
x+y+z=50 (2) 7 V/ n7 \( D! E# j4 S$ [Equation(1) means that the total amount paid is equal t ...
; {# Q6 d/ W4 S M# A:lol::lol:. `5 Z5 Q& p8 U/ M7 Z G
楼主的标题就是给你写的!4 F. ~7 P; O5 x: N; ~4 w* x
你看看我们智力超群的同学们回答的都多好啊!