A=1999/2000

B=199/200

C=511/512

hok tốt

Đáp án

mình lười trình bày cách làm lém, để đáp án thui nha

A = \(\frac{1999}{2000}\)

B = \(\frac{199}{200}\)

C = \(\frac{511}{512}\)

1 gấp 10 lần 1/10

1/10 : 1/100 = 10

1/100 : 1/1000 = 10

1 : 1/10 = 10

1/10 gấp 10 lần 1/100

1/100 gấp 10 lần 1/1000

k mình nha

a)\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}......\frac{99}{100}\)

\(=\frac{1.2.3.4.....99}{2.3.4.5.6.....100}\)

\(=\frac{1}{100}\)

b) Tương tự như câu a

Ra kết quả phần b là \(\frac{101}{2}\) đúng hông?

Ta có: \(L=\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right)....\left(1-\frac{1}{2004}\right)\)

\(\Rightarrow L=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.....\frac{2003}{2004}\)\(=\frac{1.2.3.4....2003}{2.3.4.....2004}=\frac{1}{2004}\)

VẬY \(L=\frac{1}{2004}\)

\(L=\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x.....x\left(1-\frac{1}{2003}\right)\)

\(L=\frac{1}{2}x\frac{2}{3}x\frac{3}{4}x.....x\frac{2002}{2003}\)

\(L=\frac{1x2x3x4x....x2002}{2x3x4x5x.....x2003}=\frac{1}{2003}\)

\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times...\times\left(1-\frac{1}{2015}\right)\times\left(1-\frac{1}{2016}\right)\)

\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{2014}{2015}\times\frac{2015}{2016}\)

\(=\frac{1}{2016}\)

Giải : Ta có                (1-1/2)*(1-1/3)*(1-1/4)*....*(1-1/2015)*(1-1/2016)  

                                = 1* -(1/2+1/3+1/4+....+1/2015+1/2016)

                                = 1* - (1/2+1/2016 +1/3+1/2015 +...+1/1007)

                                = 1* -(1/2033134)

                                = -1/2033134

\(a.1\frac{1}{3}+2\frac{1}{2}\)

\(=\frac{4}{3}+\frac{5}{2}\)

\(=\frac{8}{6}+\frac{15}{6}\)

\(=\frac{23}{6}\)

\(b.3\frac{2}{5}-1\frac{1}{7}\)

\(=\frac{17}{5}-\frac{8}{7}\)

\(=\frac{119}{35}-\frac{40}{35}\)

\(=\frac{79}{35}\)

\(c.3\frac{1}{2}.1\frac{1}{7}\)

\(=\frac{7}{2}.\frac{8}{7}\)

\(=4\)

\(d.4\frac{1}{6}:2\frac{1}{3}\)

\(=\frac{25}{6}:\frac{7}{3}\)

\(=\frac{25}{6}.\frac{3}{7}\)

\(=\frac{25}{14}\)

1 + 1 = 2

3 + 3 = 6

5 + 5 = 10

1 + 0 = 1

99 + 1 = 100

9 + 1 = 10

5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 5 + 5 + 5 + 7 + 7 + 7 = 88

k mk nha

2

6

10

1

100

10

83

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