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23#
發表於 2009-3-26 01:29 PM
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pure math
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* U8 `4 i. U y0 \( S9 Q. G5.39.217.76[250(80x+1)+2y-250]/2 = (250*80x+2y)/2 = (2000x+2y)/2 = 1000x+y. g, Y# b+ \8 Q/ \
公仔箱論壇% |% j% v | a; h1 ?! J! }
if x = 111 y = 2222, you number is 111-2222 |
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