98,002

3,07

2,8 

\(98\frac{2}{100}=98,02\)

\(3\frac{7}{100}=3,07\)

\(\frac{28}{10}=2,8\)

\(98\frac{2}{1000}=98,002\)

\(3\frac{7}{100}=3,07\)

\(\frac{28}{10}=2,8\)

kb vs mk nha

Là 0,3 nha

\(\frac{30}{100}=\frac{3}{10}=0,3\)

Đ/s: ... 

180 nhe bạn k mình nhe chúc bạn học tốt 

3/10 và 0,3

85/100,0,85

54/1000,0,054

Ai đó tk mk nha,mk đang âm điểm,mk hứa sẽ tk lại

3 dm = 0.3 m 

85 cm = 0.85 m 

52 mm = 0.052 m 

\(\frac{3}{10}\)và \(0,3\)

\(\frac{85}{100}\)và \(0,85\)

\(\frac{54}{1000}\)và \(0,054\)

M = \(15.\left(\frac{1}{15.16}+\frac{1}{16.17}+...+\frac{1}{19.20}\right)\)
= \(15.\left(\frac{1}{15}-\frac{1}{16}+\frac{1}{16}-\frac{1}{17}+...+\frac{1}{19}-\frac{1}{20}\right)\)
= \(15.\left(\frac{1}{15}-\frac{1}{20}\right)\)
= \(15.\frac{1}{60}\)= \(\frac{1}{4}\)\(< \frac{1}{3}\)
(=) \(M< \frac{1}{3}\)\(\left(đpcm\right)\)

Ta có: \(M=\frac{15}{15.16}+\frac{15}{16.17}+\frac{15}{17.18}+\frac{15}{18.19}+\frac{15}{19.20}\)

\(\Rightarrow M=15.\left(\frac{1}{15.16}+\frac{1}{16.17}+\frac{1}{17.18}+\frac{1}{18.19}+\frac{1}{19.20}\right)\)

\(\Rightarrow M=15.\left(\frac{1}{15}-\frac{1}{16}+\frac{1}{16}-\frac{1}{17}+\frac{1}{17}-\frac{1}{18}+\frac{1}{18}-\frac{1}{19}+\frac{1}{19}-\frac{1}{20}\right)\)

\(\Rightarrow M=15.\left(\frac{1}{15}-\frac{1}{20}\right)\)

\(\Rightarrow M=15.\frac{1}{60}=\frac{1}{4}\)

Ta thấy: \(\frac{1}{4}< \frac{1}{3}\Rightarrow M< \frac{1}{3}\)

Vậy \(M< \frac{1}{3}\)

Chúc bạn học tốt!

\(\Rightarrow M=15.\left(\frac{1}{15.16}+\frac{1}{16.17}+...+\frac{1}{19.20}\right)\)

\(M=15.\left(\frac{1}{15}-\frac{1}{16}+\frac{1}{16}-\frac{1}{17}+...+\frac{1}{19}-\frac{1}{20}\right)\)

\(M=15.\left(\frac{1}{15}+\left(-\frac{1}{16}+\frac{1}{16}\right)+\left(-\frac{1}{17}+\frac{1}{17}\right)+...+\left(\frac{-1}{19}+\frac{1}{19}\right)-\frac{1}{20}\right)\)

\(M=15.\left(\frac{1}{15}+0+0+0+...+0-\frac{1}{20}\right)\)

\(M=15.\left(\frac{1}{15}-\frac{1}{20}\right)=\frac{15}{60}\)

Mà \(\frac{1}{3}=\frac{20}{60}\)

\(\Rightarrow M< \frac{1}{3}\)

Vậy : \(M< \frac{1}{3}\)

2/5=4/10=0,4

0,9 = 9/10

0,123 = 123/1000

0,03 = 3/100

0,77 = 77/100

0,021 = 21/1000

0,9=\(\frac{9}{10}\)

0,123=\(\frac{123}{1000}\)

0,03=\(\frac{3}{100}\)

0,77=\(\frac{77}{100}\)

0,021=\(\frac{21}{1000}\)

k mk nha

0,9 = \(\frac{9}{10}\)

0,123 = \(\frac{123}{1000}\)

0,03 = \(\frac{3}{100}\)

0,77 = \(\frac{77}{100}\)

0,021 = \(\frac{21}{1000}\)

ủng hộ nha, thanks

8,35 = \(\frac{835}{100}\) (= \(\frac{167}{20}\))

835/100

\(\frac{835}{100}\)

\(1m^2\)= 0,0001 ha

\(18m^2\)=0,0018 ha

\(300m^2\)=0,03 ha 

\(1530dm^3\)=\(1,53m^3\)

k nha !!!

1/7=0,14285...

(tick na các pạn)

1/7=1:7=0,14285...