Tim so du cua cac phep chia:
a, 2015^2016 cho 11
b, 2^2018 - 2^2017 cho 3
tim so du cua phep chia 2^2018 cho 1+2+2^2+2^3+...+2^2015
tim so du trong phep chia
22015+32017 cho 5
Ta có : \(2^{2015}+3^{2017}=2^{2012+3}+3^{2016+1}\) = \(2^{2012}.2^3+3^{2016}.3\)
= \(2^{2012}.8+3^{2016}.3\) = (........6).8 + (.......1) .3 = (.........8) + (..........3) = (........1)
=> \(2^{2015}+3^{2017}\) chia 5 dư 1.
k nha bạn
tim so du cua phep chia 19n^n +5n^2+1890n+2016 chia cho (n-1)^2
tim so du cua phep chia 19n^n +5n^2+1890n+2016 chia cho (n-1)^2
tim so du cua phep chia 22017 cho 1+2+22+23+....+22013+22014
tim so du cua phep chia x^2016+x^2015+...+1 chia cho x-1
giup ho minh nha thu 6 minh thi roi
1. cho mot so duoc viet boi 100,so tu nhien lien tiep bat dau tu so 1,tim so du cua A khi chia cho 9.
bai 2. dien vao dau sao mot so de duoc ;
a]2002✳ chia het cho 3
b]20✳5chia het cho9
c]✳9984 chia het cho 3...khoang ko chia het cho 9
bai 3; tim du cua cac so sau khi chia cho 2,3,5,9.
a]1738 ;b]2017;c]2018;d]1020
bai 4;tim du cac tong sau khi chia cho 9
a]105 cong 375
b] 1997.1998 cong 1999
c]2017.2018 cong 2019
so sánh 2 p/s A=2015/2016+2016/2017+2017/2018 va B=2015+2016+2017/2016+2017+2018
Ta có \(B=\frac{2015+2016+2017}{2016+2017+2018}\)
\(\Leftrightarrow B=\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
Vì
\(\frac{2015}{2016}>\frac{2015}{2016+2017+2018};\frac{2016}{2017}>\frac{2016}{2016+2017+2018};\frac{2017}{2018}>\frac{2017}{2016+2017+2018}\) nên \(\frac{2015}{2016}+\frac{2016}{2017}+\frac{2017}{2018}>\frac{2015}{2016+2017+2018}+\frac{2016}{2016+2017+2018}+\frac{2017}{2016+2017+2018}\)
Hay \(A>B\)
tim so du cua phep chia A cho 9 biet A la 1 so tu nhin gom 2015 chu so 4
Tổng các chữ số của A là : 4 x 2015 = 8060.Vì 8060 : 9 dư 5 nên A : 9 dư 5