標題:
送10分!!!!!! 數學題(easy)奧maths
發問:
(1) 2x+3x=290-3x (2) 20012-20002+857x49 (3) 99992+(10000+1111x9)=
(2) 20012-20002+857x49 Leta=2000 20012-20002+857x49 =20012-20002+5999 =(a+1)2-a2+3a-1 =a2+2a+1-a2+3a-1 =5a =10000 (3) 99992+(10000+1111x9) Let a=9999 a2+(a+1+a) =a2+a+1 =a(a+1)+1 =9999*10000 +1 =99990001 2007-03-17 16:19:33 補充: (1) 2x+3x=290-3xx=5
其他解答:
送10分!!!!!! 數學題(easy)奧maths
發問:
(1) 2x+3x=290-3x (2) 20012-20002+857x49 (3) 99992+(10000+1111x9)=
此文章來自奇摩知識+如有不便請留言告知
最佳解答:(2) 20012-20002+857x49 Leta=2000 20012-20002+857x49 =20012-20002+5999 =(a+1)2-a2+3a-1 =a2+2a+1-a2+3a-1 =5a =10000 (3) 99992+(10000+1111x9) Let a=9999 a2+(a+1+a) =a2+a+1 =a(a+1)+1 =9999*10000 +1 =99990001 2007-03-17 16:19:33 補充: (1) 2x+3x=290-3xx=5
其他解答:
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