0 v& E& e" N* v _# p- M7 ~( _小西瓜1元2个, 一个就是5毛,50个就是 5*50, 五五三十五,三十五块买了50各西瓜, 15块小费。 7 ?7 r. n* ?# D' u7 J. {0 M. ?$ z 2 \6 b% S. C1 E3 S R. {下一个问题,这50个西瓜怎么分?
Originally posted by knptmug at 2005-4-20 09:47 PM:/ h& r. A. l& ^( z& Z
set small watermelon: x, middle watermelon y and big watermeton z 3 q$ `4 K+ ?+ z8 _9 E$ P* I ( C4 M; V2 r$ Ctwo simultaneous equations are set up: 7 ?6 c3 B" P* g, ~6 j' ?$ y; a& k" g0.5x+2y+5z=50 (1) ( ^0 j/ ^! Z9 X3 Jx+y+z=50 (2)1 ^: n( @* Z( v( m5 O1 p
Equation(1) means that the total amount paid is equal t ...
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:lol::lol:# _6 F0 }* k# o: E% _+ a, p# u5 P' v
楼主的标题就是给你写的! I. J) |3 G3 f0 }* c: H你看看我们智力超群的同学们回答的都多好啊!