( 1.3 / -3.9 ) - { ( -3 ) /4- [ ( -1/3 ) - ( -1/5+0.7 ) x ( -1/5+0.7 ) ] }
答案是 - 1/6
運算過程是怎樣的?
正負數數學問題
2009-07-31 9:10 pm
回答 (2)
2009-07-31 9:35 pm
✔ 最佳答案
(-1/5 + 0.7) = 0.50.5 x 0.5 = 0.25 = 1/4
[-1/3 - 1/4] = -7/12
{-3/4 + 7/12} = -1/6
(1.3/-3.9) = -1/3
所以 -1/3 + (-1/6) = -1/6
2009-07-31 9:35 pm
收錄日期: 2021-04-23 20:47:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090731000051KK00819