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g) Đặt a = 0,3(12) => 1000a - 10a = 312,(12) - 3,(12) => 990a = 309 => a = \(\frac{309}{990}=\frac{103}{330}\).
Câu h tương tự
\(1,2\left(3\right)=\frac{407}{330}\)
\(2,0\left(6\right)=\frac{31}{15}\)
a) 0,32 = \(\frac{32}{100}=\frac{2^5}{10^2}=\frac{2^5}{\left(2.5\right)^2}=\frac{2^3}{5^2}=\frac{8}{25}\)
b) -0,124 = \(\frac{124}{1000}=\frac{-31.4}{10^3}=\frac{-31.2^2}{2^3.5^3}=\frac{-31}{2.5^3}=\frac{-31}{250}\)
c) 1,28 = \(\frac{32}{25}\)
d) -3,12 = \(\frac{-78}{25}\)
ok mk nhé!! 4354655756768679235255435464566757687698989783635456546575675675676876876
a) \(0,32=\) \(\frac{32}{10}=\frac{16}{5}\)
b) \(-0,124=-\frac{124}{1000}=-\frac{31}{250}\)
c) \(1,28=\frac{128}{100}=\frac{32}{25}\)
d) \(-3,12=-\frac{312}{100}=-\frac{78}{25}\)
nha bn
1) b) \(0,555..=0,\left(5\right)=\frac{5}{9}\)
a) 0,555=\(\frac{555}{1000}=\frac{111}{200}\)
c) \(0,25454..=0,2\left(54\right)=\frac{14}{55}\)
2) a) \(1,\left(6\right).2,\left(3\right):0,\left(7\right)=\frac{5}{3}.\frac{7}{3}:\frac{7}{9}=\frac{35}{9}:\frac{7}{9}=5\)
b) \(0,\left(37\right)+0,\left(62\right)=\frac{37}{99}+\frac{62}{99}=1\)
c) \(0,\left(33\right).3=\frac{1}{3}.3=1\)
0,3(18)=0,3+0,0(18)=0,3+0,0(01). 18 =0,3+\(\frac{1}{990}.18=\frac{3}{10}+\frac{1}{55}=\frac{7}{22}\)
\(\text{a) }0.3\left(12\right)=\dfrac{312-3}{990}=\dfrac{103}{330}\)
\(\text{b) }2.0\left(33\right)=2\dfrac{033-0}{990}=2\dfrac{33}{990}=3\dfrac{1}{30}=\dfrac{91}{30}\)
a) 18/5
b)66