estimate the value of the following expressions and state the estimation strategies used.
(a) 89 + 75 + 77 + 79 + 80 + 83 +83 + 78
(b)161.46 * 0.49
(c)179.8*0.68
(d)6059.5/5.95
(e) 649.7*4.12/19.97
Some estomation question...
2009-02-13 4:46 am
回答 (1)
2009-02-17 2:27 am
✔ 最佳答案
a. rounding89 + 75 + 77 + 79 + 80 + 83 +83 + 78
=90+80+80+80+80+80+80+80
=650
b. compatible numbers
161.46 * 0.49
=160*0.5
=80
c. compatible numbers
179.8*0.68
=180*2/3
=120
d. compensation strategy
6000/5.95 ≈ 6000/6 ≈ 1000
and 59.5/5.95 = 10
∴6059.5/5.95 ≈ 1000 + 10 =1010
e. translation strategy
649.7*4.12/19.97
=649.7*(4.12/19.97)
≈650*(4/20)
=650/5
=130
收錄日期: 2021-04-13 16:25:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090212000051KK01659