7) 當某數增加32%,再乘上80%,結果係1.9008.求某數.
8) 某數的3倍加上28,等於該數的5倍加上12.求某數.
數學問題 2題~!
2007-08-22 9:32 pm
回答 (2)
2007-08-22 9:40 pm
✔ 最佳答案
當某數增加32%,再乘上80%,結果係1.9008.求某數.設某數為x,
x*(1+32%)*80% = 1.9008
x*(1+32%) = 1.9008 / 0.8
x*1.32 = 2.376
x = 2.376 / 1.32
x = 1.8
8) 某數的3倍加上28,等於該數的5倍加上12.求某數.
設某數為x,
3x + 28 = 5x + 12
2x = 16
x = 8
2007-08-22 9:35 pm
X (1+32%)(80%)=1.9008
3X+28=5X+12
3X+28=5X+12
收錄日期: 2021-04-20 18:36:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070822000051KK02289