設 x△y = 2x+y , 而 :
x△2x△3x△4x△5x△6x△7x△8x = 1506
請問x究竟是多少?
數學IQ題(急~~~)
2007-09-30 6:34 pm
回答 (4)
2007-09-30 8:55 pm
✔ 最佳答案
x=3x△2x=4x
4x△3x=11x
11x△4x=26x
26x△5x=57x
57x△6x=120x
120x△7x=247x
247x△8x =502x
502x=1506
x=3
2007-10-01 3:47 am
x△2x△3x△4x△5x△6x△7x△8x = 1506
2^7*x + 2*2^6*x + 3*2^5*x + 4*2^4*x + 5*2^3*x + 6*2^2*x + 7*2*x + 8x =1506
(2^7+2^7+3*2^5+2*2^5+5*2^3+3*2^3+14+8)x=1506
(2^8+5*2^5+8*2^3+22)x=1506
(2^8+5*2^5+2*2^5+22)x=1506
(256+7*32+22)x=1506
x=1506/(256+224+22)
x=1506/502
x=3
2^7*x + 2*2^6*x + 3*2^5*x + 4*2^4*x + 5*2^3*x + 6*2^2*x + 7*2*x + 8x =1506
(2^7+2^7+3*2^5+2*2^5+5*2^3+3*2^3+14+8)x=1506
(2^8+5*2^5+8*2^3+22)x=1506
(2^8+5*2^5+2*2^5+22)x=1506
(256+7*32+22)x=1506
x=1506/(256+224+22)
x=1506/502
x=3
參考: 不可靠的頭腦
2007-09-30 9:19 pm
△is what
x=1to10
x=1to10
2007-09-30 6:41 pm
△係符號定代數先？
收錄日期: 2021-04-13 13:40:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070930000051KK01119