Tính nhanh
48.127+26.127+127.26
1+2+3+....+199+20 (bài này các bạn giải thích cho mk nha 😙😙)
Mong các bạn giúp đỡ 😁😁😁
K
Khách
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T
5
7 tháng 1 2018
trong sáng, sáng trưng, sáng lòa
kb với mik mình tìm cho nhiều hơn
L
2
PH
2
4 tháng 5 2020
2-3+4-5.......+2008-2009+2010-2011
\(=\left(2-3\right)+\left(4-5\right)+......+\left(2008-2009\right)+\left(2010-2011\right)\)(có tất cả 1005 số hạng -1)
\(=-1.1005=-1005\)
Học tốt
NV
0
a) 48 . 127 + 26 . 127 + 127 . 26
= 127 . ( 48 + 26 + 26 )
= 127 . 100
= 12700
b)
B1 : Tìm số số hạng bằng công thức : ( a - b ) : khoảng cách giữa 2 số liên tiếp + 1 ( a là số cuối, b là số đầu tiên )
Trong trường hợp này là : ( 20 - 1 ) : 1 + 1 = 20 ( số )
B2 : Tính tổng bằng công thức : ( a + b ) . số số hạng : 2 ( a là số cuối, b là số đầu )
Trong trường hợp này là : ( 20 + 1 ) . 20 : 2 = 210
Vậy,......
\(127.\left(48+26+26\right)\)
\(127.100=12700\)
câu 2
\(\left(120-1+1\right).\left(120+1\right):2\)
\(=120.121:2=7260\)