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Số số hạng dãy số trên là :
( 2016 - 101 ) : 1 + 1 = 1916
Đáp số : 1916
Công thức : ( Số cuối - số đầu ) : KC + 1
Nhớ k mk
2016 x 14 + 2016 x 85 + 2016
= 2016 x 14 + 2016 x 85 + 2016 x 1
= 2016 x (14 + 85 + 1)
= 2016 x 100 = 201600
2016.34+2016.63+2016.2+2016
= 2016.(34+63+2+1)
= 2016 . 100
= 201600.
Chúc bn hk tốt!!!
= 2016 * (34+63+2) +2016
=20169 * 99 +2016
=199584 + 2016
=201600 .
Tck mk nha , thanhk you
\(A=\frac{1}{2016}+\frac{2}{2016}+\frac{3}{2016}+...+\frac{2015}{2016}\)
\(A=\frac{1+2+3+...+2015}{2016}=\frac{2031120}{2016}=\frac{2015}{2}\)
Ta có :A=\(\frac{1}{2016}+\frac{2}{2016}+...+\frac{2015}{2016}=\frac{1+2+...+2015}{2016}\)
Xét 1+2+ ... +2015 = \(\frac{2015\times2016}{2}=2031120\)---> A=\(\frac{2031120}{2016}=1007,5\)
=(1+2+3+...+2015)/2016=(2015.(2015+1):2)/2016=2031120/2016=2015/2
\(\frac{1}{2016}\)+ \(\frac{3}{2016}\)+ \(\frac{5}{2016}\)+..........+ \(\frac{2015}{2016}\)= \(\frac{1+3+5+....+2015}{2016}\)
=\(\frac{1016064}{2016}\)= \(504\)
\(\frac{1}{2016}\)\(+\frac{3}{2016}\)\(+\frac{5}{2016}\)\(+...+\frac{2015}{2016}\)
\(=\frac{1+3+5+...+2015}{2016}\)
\(=\frac{1016064}{2016}\)
\(=504\)
2016 × 35 + 2016 × 65
= 2016 × (35+65)
= 2016 × 100
= 201600
2016 × 99 + 2016
= 2016 × 99 + 2016 × 1
= 2016 × (1+99)
= 2016 × 100
= 201600
2016 × 102 - 2016 × 2
= 2016 × (102-2)
= 2016 × 100
= 201600
2016 × 101 - 2016
= 2016 × 101 - 2016 × 1
= 2016 × (101-1)
= 2016 × 100
= 201600
2016 x 35 + 2016 x 65
= 2016 x ( 35 + 65 )
= 2016 x 100
= 201600
2016 x 99 + 2016
= 2016 x 99 + 2016 x 1
= 2016 x ( 99 + 1 )
= 2016 x 100
= 201600
2016 x 102 - 2016 x 2
= 2016 x ( 102 - 2 )
= 2016 x 100
= 201600
2016 x 101 - 2016
= 2016 x 101 - 2016 x 1
= 2016 x ( 101 - 1 )
= 2016 x 100
= 201600