Originally posted by knptmug at 2005-4-20 09:47 PM: - p: h( j1 t* p5 [9 J+ s nset small watermelon: x, middle watermelon y and big watermeton z/ z! J( e4 z8 n9 Z% L
. J* l+ H; e2 Z# Dtwo simultaneous equations are set up: 1 f6 N/ T& g# d' j8 f/ ~& \9 C0.5x+2y+5z=50 (1) " m: R1 n2 _* S, Z. }6 `3 ox+y+z=50 (2) 6 O7 e3 ^2 P& W3 @, C; {, V$ pEquation(1) means that the total amount paid is equal t ...
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:lol::lol:- B0 p3 A& Q; X4 d- m# `& I
楼主的标题就是给你写的!3 c9 k- M R9 _
你看看我们智力超群的同学们回答的都多好啊!