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The disjunctive form and the calculation of the answers in the first volume of the fourth grade
A simple method is used for calculation
1、368＋2649＋1351 =368+（2649＋1351）=368+4000=4368
2、 89＋101＋111=（89+111）+101=200+101=301
3、24＋127＋476＋573=（24+476）+（127+573）=500+700=1200
4、400－273－127=400-（273+127）=0
5、327＋（96－127）=327-127+96=296
We can see that the law of exchange and the law of association of addition and subtraction are used
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Who can help me out of the fourth grade first volume 30 to simple calculation take off test?
75÷〔138÷（100-54）〕 85×(95－1440÷24) 80400－(4300＋870÷15) 240×78÷（154-115） 1437×27＋27×563 〔75-（12+18）〕÷15 2160÷〔（83-79）×18〕 280＋840÷24×5 325÷13×(266－250) 85×(95－1440...
Simple calculation!
108 × 99 and 99 × 101 × 99
1：108*（100-1）=10800-108=10692
2：9999*（100-1）=999900-9999=989901
In a 200 meter long road, two rows of trees were planted on both sides. The starting point and the ending point were planted. A total of 52 trees were planted. The distance between two adjacent trees was equal. Find the distance between two adjacent trees
25 divided by 200
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