Originally posted by knptmug at 2005-4-20 09:47 PM:4 P# F. r5 b& w- p2 b
set small watermelon: x, middle watermelon y and big watermeton z; m( ~3 |( X9 v% G& m3 h* \
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two simultaneous equations are set up: # S; }9 F4 r, B0.5x+2y+5z=50 (1) ! I1 D$ h" D# J, @% Z" jx+y+z=50 (2) 0 x$ |. P/ k2 Y) W$ o% ZEquation(1) means that the total amount paid is equal t ...
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楼主的标题就是给你写的!0 F8 d L5 \+ y0 j3 P
你看看我们智力超群的同学们回答的都多好啊!