Originally posted by knptmug at 2005-4-20 09:47 PM: 3 A, I4 k9 ]/ k! M; c fset small watermelon: x, middle watermelon y and big watermeton z7 z% \( B+ [* o/ c+ _
+ A6 J9 J3 F, B3 ]( T6 {3 atwo simultaneous equations are set up:$ k& V: z2 w) C" [* F# g1 s
0.5x+2y+5z=50 (1)( ~4 A# h7 e8 h1 c% a# L
x+y+z=50 (2)) f( D& ^3 ]: D: Q" V5 P
Equation(1) means that the total amount paid is equal t ...
# Y v9 }# R1 m: X4 ~& P- g1 [:lol::lol:2 J% K K# p- s# A
楼主的标题就是给你写的!6 \4 ?- X7 F: y( D. Y6 L
你看看我们智力超群的同学们回答的都多好啊!