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Cho A= 1/2 + 2/2^2 + 3/2^3 + .... + 99/2^99 + 100/2^100
So sánh A với 2
Xl mấy bạn mk gõ thiếu bài gốc đây nhá Giải giúp mk với nạ
Tham khảo
S =12 + 22 + 32 +......+ 992 + 1002
= 1 + 2.(1 + 1) + 3.(1 + 2) + ... + 99.(1 + 98) + 100.(99 + 1)
= 1 + 2.1 + 2 + 3.1 + 3.2 +... + 99.1 + 99.98 + 100.99 + 100.1
= (2.1 + 2.3 + ... + 99.99 ) + (1 + 2 + 3 + ... + 99 + 100)
= 333300 + 5050
= 338350
\(S=1^2+2^2+3^2+...+99^2+100^2\)
\(=1.1+2.2+3.3+...+100.100\)
\(=1\left(2-1\right)+2\left(3-1\right)+3\left(4-1\right)+...+100\left(101-1\right)\)
\(=\left[1.2-1+2.3-1.1+3.4-3+1+...+100.101-100.1\right]\)
\(=\left[1.2+2.3+3.4+...+100.101\right]-\left(1+2+3+...+100\right)\)
\(=\dfrac{100.101.102}{3}-\dfrac{100.101}{2}\)
\(\dfrac{100.101.\left(2.100+1\right)}{6}=338350\)
a, S= 1/1*2 + 1/2*3 + 1/3*4 +...+1/99*100
S= 1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 +...+ 1/99 - 1/100
S= 1/1 - 1/100
S= 100/100 - 1/100
S= 99/100
b, S= 1/1*3 + 1/3*5 + 1/5*7 +...+1/99*101
S= 1/2* (2/1*3 + 2/3*5 + 2/5*7 +...+ 2/99*101)
S= 1/2* (1/1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 +...+ 1/99 - 1/101)
S= 1/2* (1/1 - 1/101)
S= 1/2* (101/101 - 1/101)
S= 1/2* 100/101
S= 50/101
Chúc bạn học tốt nha
Ta có :
S=3+32+33+34+....+32015
3S=32+33+34+35+....+32016
3S-S=(32+33+34+35+....+32016)-(3+32+33+....+32015)
2S=32016-3
S=(32016-3):2
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cho đường cao của ba tam giác lần lượt là 4, 12 và x . tìm x biết x là một số tự nhiên
\(A=\dfrac{1}{2}+\dfrac{2}{2^2}+\dfrac{3}{2^3}+...+\dfrac{99}{2^{99}}+\dfrac{100}{2^{100}}\)
\(2A=1+1+\dfrac{3}{2^2}+...+\dfrac{99}{2^{98}}+\dfrac{100}{2^{99}}\)
\(2A-A=\left(1+1+\dfrac{3}{2^2}+...+\dfrac{99}{2^{98}}+\dfrac{100}{2^{99}}\right)-\left(\dfrac{1}{2}+\dfrac{2}{2^2}+\dfrac{3}{2^3}+...+\dfrac{99}{2^{99}}+\dfrac{100}{2^{100}}\right)\)
\(A=1+\dfrac{1}{2}+\dfrac{1}{2^2}+...+\dfrac{1}{2^{98}}+\dfrac{1}{2^{99}}-\dfrac{100}{2^{100}}\)
Đặt:
\(B=1+\dfrac{1}{2}+\dfrac{1}{2^2}+....+\dfrac{1}{2^{98}}+\dfrac{1}{2^{99}}\)
\(2B=2+1+\dfrac{1}{2^2}+....+\dfrac{1}{2^{97}}+\dfrac{1}{2^{98}}\)
\(2B-B=\left(2+1+\dfrac{1}{2^2}+....+\dfrac{1}{2^{97}}+\dfrac{1}{2^{98}}\right)-\left(1+\dfrac{1}{2}+\dfrac{1}{2^2}+...+\dfrac{1}{2^{98}}+\dfrac{1}{2^{99}}\right)\)
\(B=2-\dfrac{1}{2^{99}}\)
Vậy \(A=2-\dfrac{1}{2^{99}}-\dfrac{100}{2^{100}}< 2\)
Bây giờ mình đang bận học bài 1 chút.Xíu nữa mình làm cho nhé
S= 12+22+32+42+.....+992+1002
S =1.(2-1)+2.(3-1)+3.(4-1)+....+99.(100-1)+100.(101-1)
=1.2-1.1+2.3-1.2+3.4-1.3+...+99.100-1.99+100.101-1.100
=(1.2+2.3+3.4+...+99.100+100.101)-(1+2+3+...+100)
S= [1.2.3+2.3.(4-1)+3.4.(5-2)+...+100.101.(102-99) ] /3 + [(100+1).100 /2]
( Ở đây là cái tổng ở trên nhân 3 nên cuối mới chia 3)
=[1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+....+100.101.102-99.10.101]/3 + 5050
=100.101.102/3 + 5050
=348450
S= 12+22+32+42+.....+992+1002
S =1.(2-1)+2.(3-1)+3.(4-1)+....+99.(100-1)+100.(101-1)
=1.2-1.1+2.3-1.2+3.4-1.3+...+99.100-1.99+100.101-1.100
=(1.2+2.3+3.4+...+99.100+100.101)-(1+2+3+...+100)
S= [1.2.3+2.3.(4-1)+3.4.(5-2)+...+100.101.(102-99) ] /3 + [(100+1).100 /2]
( Ở đây là cái tổng ở trên nhân 3 nên cuối mới chia 3)
=[1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+....+100.101.102-99.10.101]/3 + 5050
=100.101.102/3 + 5050
=348450
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