Originally posted by knptmug at 2005-4-20 09:47 PM: 0 B* a5 u: A3 O6 R( Oset small watermelon: x, middle watermelon y and big watermeton z 9 l' S2 a" p; s4 n0 [9 @% l3 U$ u0 R9 D( p+ B0 h% \# E. c" ]# t
two simultaneous equations are set up:! i( z' O- O* ]9 X* k# e/ @
0.5x+2y+5z=50 (1)2 F- Z T: w2 O
x+y+z=50 (2)1 U! ]. @) @* T7 a, c+ R( v+ f
Equation(1) means that the total amount paid is equal t ...
( M; U- {; @- I7 o0 H1 O
:lol::lol:& p7 n% w' R& p, X& b: @* R2 m( A* v
楼主的标题就是给你写的! & z' _* h Q: W你看看我们智力超群的同学们回答的都多好啊!