利用轉移策略,估算下列數式的值。
(a) 0.33÷120x99
(b) 3488x8÷7
利用適當的估算策略,估算下列數式的值。
(a) 50-39x2.51÷9.88 (b) (1.21+2.88+7.3+0.8)x2.3÷12
注 : 過程
easy 數學
2007-02-01 2:00 am
回答 (5)
2007-02-01 2:13 am
✔ 最佳答案
(a) 0.33x100(99)/120~30(33)/100(120)
~0.03
(b) 3500(3488)x8/7
~3500/7x8
~500x8
~4000
(A)50/10(9.88)x2.5(2.51)-40
~5x2.5-40
~13(12.5)-40
~-27
(B)(1.2(1.21)+3(2.88)+7(7.3)+1(0.8))x2(2.3)/12
~12.2x2/12
~24(24.4)/12
~2
2007-01-31 18:14:19 補充：
頭1條(a) 答案應該係 0.3
參考: 自己, 唔知岩唔岩?
2007-02-01 2:38 am
(a)0.33÷120x99
=0.27225
(b) 3488x8÷7
=3986
(a) 50-39x2.51÷9.88
=-59
(b) (1.21+2.88+7.3+0.8)x2.3÷12
=2
=0.27225
(b) 3488x8÷7
=3986
(a) 50-39x2.51÷9.88
=-59
(b) (1.21+2.88+7.3+0.8)x2.3÷12
=2
參考: me
2007-02-01 2:15 am
(a)0.33/120x99=36.33............
(b)3488x8/7=3986............
(a)50-39x2.51÷9.88= 9.89.......................
(b)(1.21+2.88+7.3+0.8)x2.3÷12 =23.31
(b)3488x8/7=3986............
(a)50-39x2.51÷9.88= 9.89.......................
(b)(1.21+2.88+7.3+0.8)x2.3÷12 =23.31
2007-02-01 2:08 am
(a) 0.33÷120x99
= 0.27225
(b) 3488x8÷7
= 3,986.285714
a) 50-39x2.51÷9.88 (b) (1.21+2.88+7.3+0.8)x2.3÷12
a) =40.09 b) 33.6444
= 0.27225
(b) 3488x8÷7
= 3,986.285714
a) 50-39x2.51÷9.88 (b) (1.21+2.88+7.3+0.8)x2.3÷12
a) =40.09 b) 33.6444
收錄日期: 2021-04-13 19:21:08
原文連結 [永久失效]:
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