Originally posted by knptmug at 2005-4-20 09:47 PM: $ c7 H8 W5 R7 M2 I8 i5 ~& Pset small watermelon: x, middle watermelon y and big watermeton z( W+ c2 \& a' }8 r" n ]
# b6 ?- f2 T1 {0 m' Z1 o' N- G
two simultaneous equations are set up:9 K. f, [' C/ F) @' ~
0.5x+2y+5z=50 (1) 8 I! d/ @% Z1 m# ^x+y+z=50 (2)/ P7 i+ G( L! w& C5 ]9 J+ N
Equation(1) means that the total amount paid is equal t ...
* k; `2 i( |: w6 [7 y! p* K
:lol::lol:. F' z8 `3 f& U
楼主的标题就是给你写的!2 H1 M8 d) |8 o; [6 \
你看看我们智力超群的同学们回答的都多好啊!