Originally posted by knptmug at 2005-4-20 09:47 PM:7 K: t8 a8 h7 z# z
set small watermelon: x, middle watermelon y and big watermeton z 4 Y- _) r$ |1 a* K) u7 [9 |' ]2 E7 S; ~0 I
two simultaneous equations are set up: 0 H. c9 ~1 E5 [: |% J+ T6 n0.5x+2y+5z=50 (1)8 a1 A: u3 h) q. o( }0 h. ~
x+y+z=50 (2) : ~, O" k6 j, [9 W2 P: V9 ~/ OEquation(1) means that the total amount paid is equal t ...
0 @' [! f: ^" @9 v:lol::lol:+ E$ n4 q0 E1 |8 r! |2 D! Q. g2 {
楼主的标题就是给你写的! : y& \7 o$ R( W. u2 e& n( K& C. T3 k7 u& W你看看我们智力超群的同学们回答的都多好啊!