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a , 3 /8 = 3 x 27 / 8 x 27 = 81 / 216
5/27 = 5 x 8 / 27 x 8 = 40 / 216
b , -2 / 9 = -2 x 25 / 9 x 25 = -50 / 225
4/25 = 4 x 9 / 25 x 9 = 36 / 225
c , 1/15 = 1 x ( -6 ) / 15 x ( -6 ) = -6 / -90 = 6/90 = 1/10
-6 = -6 / 1 = -6 x 10 / 1 x 10 = -60 /10
Đúng tích mk nha !
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a) \(\dfrac{7}{4}\text{⇔}1\dfrac{3}{4}\text{⇔}1,75\text{⇔}\dfrac{175}{100}\text{⇔}175\%\)
b) \(\dfrac{12}{5}\text{⇔}2\dfrac{2}{5}\text{⇔}2,4\text{⇔}\dfrac{240}{100}\text{⇔}240\%\)
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a: \(1\dfrac{3}{4}=1+\dfrac{3}{4}\)
b: \(3\dfrac{5}{9}=3+\dfrac{5}{9}\)
c: \(1\dfrac{9}{10}=1+\dfrac{9}{10}\)
d: \(3\dfrac{25}{20}=3+\dfrac{5}{4}\)
e: \(=2\dfrac{55}{30}=2+\dfrac{11}{6}\)
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\(\dfrac{9}{12}=\dfrac{45}{60}\)
\(\dfrac{7}{15}=\dfrac{28}{60}\)
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1.
a) \(\frac{13}{8}:\frac{13}{4}=\frac{1}{2}=0,5=50\%\)
b) \(12,5:2,5=5=500\%\)
~ Hok tốt ~
2.
\(\left(\frac{37}{9}+\frac{13}{4}\right).\frac{9}{4}+\frac{11}{4}\)
\(=\frac{265}{36}.\frac{9}{4}+\frac{11}{4}\)
\(=\frac{265}{16}+\frac{11}{4}\)
\(=\frac{309}{16}\)
\(1+\left(\frac{9}{10}-\frac{4}{5}\right):\frac{19}{6}\)
\(=1+\frac{1}{10}:\frac{19}{6}\)
\(=1+\frac{3}{95}\)
\(=\frac{98}{95}\)
\(\left(-7+\left|13\right|\right)-\left(13-\left|-7\right|-25\right)-\left(25+\left|-10\right|-9\right)\)
\(=\left(-7+13\right)-\left(13-7-25\right)-\left(25+10-9\right)\)
\(=-7+13-13+7+25-25-10+9\)
\(=\left(-7+7\right)+\left(13-13\right)+\left(25-25\right)-10+9\)
\(=0+0+0-10+9\)
\(=-10+9\)
\(=-1\)
~ Hok tốt ~
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\(\dfrac{9}{12}=\dfrac{135}{180}\)
\(\dfrac{7}{15}=\dfrac{84}{180}\)
\(\dfrac{1}{9}\) = \(\dfrac{1.25}{9.25}\) = \(\dfrac{25}{225}\)
\(\dfrac{3}{25}\) = \(\dfrac{3.9}{25.9}\) = \(\dfrac{27}{225}\)
Vậy hai phân số \(\dfrac{1}{9}\) và \(\dfrac{3}{25}\) thành hai phân số : \(\dfrac{25}{225}\) và \(\dfrac{27}{225}\)