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a)3/4 x 2/9 + 1/3
=1/6 + 1/3
=1/6 + 2/6
=1/2
b)5/4:2.9+1/2
=1.25 : 2.9 + 1/2
=25/58 + 1/2 =27/29
c)7/2 - 1/4 x 1/5
=7/2 - 1/20
=69/20
d)5/4+1/5:2/3
=5/4 + 3/10
=31/20
Học tốt!
- \(\frac{2}{3}\)
- \(\frac{7}{4}\)
- \(\frac{6}{2}=3\)
- \(\frac{4}{10}=\frac{2}{5}\)
- \(\frac{5}{7}\)
a) 5/7 : 45/28 = 5/7 x 28/45 = 4/9
b) 3/8 x 4/9 : 3/2 = 3/8 x 4/9 x 2/3 = 1/9
\(\dfrac{11}{2}\): \(\dfrac{1}{4}\) \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{11}{2}\) \(\times\) \(\dfrac{4}{1}\) \(\times\) \(\dfrac{5}{3}\)
= 22 \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{110}{3}\)
\(\dfrac{5}{2}-\dfrac{1}{4}+\dfrac{5}{3}\)
= \(\dfrac{30}{12}-\dfrac{3}{12}+\dfrac{20}{12}\)
= \(\dfrac{7}{12}\)
\(\dfrac{14}{5}\times\dfrac{2}{3}\)+ 5
= \(\dfrac{28}{15}\) + 5
= \(\dfrac{28}{15}\) + \(\dfrac{75}{15}\)
= \(\dfrac{103}{15}\)
\(\dfrac{1}{3}=\dfrac{2}{6}=\dfrac{3}{9}=\dfrac{4}{12}\)
\(\dfrac{2}{5}=\dfrac{4}{10}=\dfrac{8}{20}=\dfrac{16}{40}\)
\(7,14=\dfrac{714}{100}=\dfrac{357}{50}=\dfrac{3570}{500}\)
\(\dfrac{25}{3}=\dfrac{100}{12}=\dfrac{150}{18}=\dfrac{200}{24}\)
\(\dfrac{25}{15}=\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{15}{9}\)
Quy đồng các phân số : \(\frac{2}{3},\frac{3}{2}và\frac{2}{5}\)
\(\frac{2}{3}=\frac{2\times2\times5}{3\times2\times5}=\frac{20}{30}\)
\(\frac{3}{2}=\frac{3\times3\times5}{2\times3\times5}=\frac{45}{30}\)
\(\frac{2}{5}=\frac{2\times3\times2}{5\times3\times2}=\frac{12}{30}\)
Vậy quy đồng phân số \(\frac{2}{3}\); \(\frac{3}{2}\)và \(\frac{2}{5}\)là : \(\frac{20}{30}\); \(\frac{45}{30}\)và \(\frac{12}{30}\)
2/5:5x2/5=2/5x1/5x2/5=4/125
0,032 (4/125)