Originally posted by knptmug at 2005-4-20 09:47 PM: $ o9 R6 d/ x' K' F/ Oset small watermelon: x, middle watermelon y and big watermeton z 0 T1 i- x) U) a: g" f, n! ~- Q, n) l: d9 k
two simultaneous equations are set up:- ^9 v9 [ p2 ~( [
0.5x+2y+5z=50 (1) 3 }8 K( u3 T* ~. i2 q+ qx+y+z=50 (2) 2 b. T7 O3 s% ?5 jEquation(1) means that the total amount paid is equal t ...
9 b. b D, v. a:lol::lol:' v. U! e$ G. A( W }
楼主的标题就是给你写的! y. ?7 b- ^; k3 r- u1 k
你看看我们智力超群的同学们回答的都多好啊!