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國1數學難題=(
Nov 6th 2013, 14:35

(1)
設此種四位數的千位數為a,百位數為b,十位數為c,個位數為d,則依題意列式可得
1001a+101b+11c+2d=2002
先逼近極限:
若a=2,則1001a=2002,2002-2002=0,因此b, c, d皆為0

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