數(shù)學綜合運算的技巧主要有以下幾種:
1. 加減乘除法的運算技巧,主要是提取公因數(shù);
2. 將數(shù)據(jù)進行拆分重組,進行運算;
3. 對數(shù)據(jù)進行湊整處理。
下面和大家分享幾個技巧:
舉例:
(1) 68 + 29 + 36 + 54 + 21 + 74 + 102
= (68 + 102) + (29 + 21) + (36 + 54) + 74
= 170 + 50 + 90 + 74
= 384
(2) 756 - 248 - 352
= 756 - (248 + 352)
= 756 - 600
= 156
(3) 8 + 88 + 888 + 8888
= (10 - 2) + (90 - 2) + (900 - 12) + (9000 - 112)
= 10000 - 128
= 9872
(4) 39 +38 + 40 + 41 + 43
= (40 - 1) + (40 - 2) + 40 + (40 + 1) + (40 + 3)
= 40 * 5 - 1 - 2 + 1 + 3
= 201
乘除法混合運算技巧
例題:
(1) 25 × 16 ÷ 20
= 25 × 4 × 4 ÷ 20
= 400 ÷ 20
= 20
(2) 1200 ÷ 4 ÷ 5 ÷ 5
= 1200 ÷ (4 × 5 × 5)
= 1200 ÷ 100
= 12
(3) 1300 × 77 ÷ 100
= 13 × 100 × 7 × 11 ÷ 100
= 7 × 11 × 13
= 1001
今天先和大家分享到這里,希望大家喜歡,謝謝
聯(lián)系客服