o一道奧數題
則(x+y)15=1575x=30,y=75 不滿足203,5020x+20y=2250(x+y)15=1575 無解4,2010025x+15y=2250(x+y)15=1575x是分數,排除5,5010020x+15y=2250(x...
則(x+y)15=1575x=30,y=75 不滿足203,5020x+20y=2250(x+y)15=1575 無解4,2010025x+15y=2250(x+y)15=1575x是分數,排除5,5010020x+15y=2250(x...