Originally posted by knptmug at 2005-4-20 09:47 PM:- {( ~; J, f1 x$ b
set small watermelon: x, middle watermelon y and big watermeton z 3 [/ N7 R; o5 }# y 3 @4 M6 g4 t* Q% r8 w0 N3 W7 Vtwo simultaneous equations are set up:1 S) ~) w9 d+ G+ P$ _: r& S
0.5x+2y+5z=50 (1)1 |, E& K' M; p. u4 c& s
x+y+z=50 (2)' c9 ^; s" ]4 j- {) k
Equation(1) means that the total amount paid is equal t ...
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你看看我们智力超群的同学们回答的都多好啊!