Question

[Chi Khánh]

a)3338 157M= Chứng minh rằng các tổng sau lớn hơn 1:

\(M=\frac{3}{8}+\frac{3}{15}+\frac{3}{7}\)

\(N=\frac{19}{60}+\frac{29}{100}+\frac{39}{150}+\frac{49}{300}\)

\(P=\frac{41}{90}+\frac{31}{72}+\frac{21}{40}+\frac{-11}{45}+\frac{-1}{36}\)
hehe :))

Answer 1

[Nguyễn Đăng Hải]

M=\(\frac{23}{40}+\frac{3}{7}=\frac{281}{280}\)>1

N=\(\frac{91}{150}+\frac{127}{300}=\frac{103}{100}\)>1

P=\(\frac{319}{360}+\frac{101}{360}+-\frac{1}{36}=\frac{7}{6}+-\frac{1}{36}=\frac{41}{39}\)>1