Originally posted by knptmug at 2005-4-20 09:47 PM: ( N7 d+ A# u2 K: G. Rset small watermelon: x, middle watermelon y and big watermeton z 1 ]/ s6 _9 B$ \! R% J" W 0 k# [) [2 A# K9 R' ~two simultaneous equations are set up: 4 z/ K5 T2 v K7 P' m) c0.5x+2y+5z=50 (1)( ^& E" j* w; @4 }
x+y+z=50 (2)/ p% P; Z- i+ e5 w5 O4 ~8 n$ c
Equation(1) means that the total amount paid is equal t ...
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:lol::lol:! G l, ?: X2 k1 _
楼主的标题就是给你写的!* M% ^$ M1 h2 t3 E* ?
你看看我们智力超群的同学们回答的都多好啊!