估計與近似值【數學=》急急急】

2009-09-08 3:01 am
A】重整法
B】補償法
C】轉移法

估計下列各數式的值,並且說明所採用的估算策略

A》7.91+6.85+5.13+9.01+8.89
B》12.1-7.9-1.89+4.08+8.8
C》8.94-29.91+139.02+80.25-21.89-12.73

A. 81+75+77+79加80+83+83+78
B. 53.1+51.9+48.7+50.2+49.2+50.6+51.1+52.4
C. -120.4-118.3-123.8-119.2-116.9-122.5-119.1-121.6

回答 (1)

2009-09-09 12:24 am
✔ 最佳答案

A》重整法(reformulation)之中既rounding off
7.91+6.85+5.13+9.01+8.89
=8+7+5+9+9
=38

B》重整法(reformulation)之中既rounding off
12.1-7.9-1.89+4.08+8.8
=12-8-2+4+9
=15

C》重整法(reformulation)之中既rounding off
8.94-29.91+139.02+80.25-21.89-12.73
=9-30+139+80-22-13
=163

A. 重整法(reformulation)之中既clutering
81+75+77+79加80+83+83+78
=80X8
=640

B. 重整法(reformulation)之中既clutering
53.1+51.9+48.7+50.2+49.2+50.6+51.1+52.4
=50X8
=400

C. 重整法(reformulation)之中既clutering
-120.4-118.3-123.8-119.2-116.9-122.5-119.1-121.6
=-120 X8
=-960
參考: me~


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