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\(\dfrac{2}{3}-\dfrac{3}{8}=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{3}{7}\times\dfrac{4}{5}=\dfrac{3\times4}{7\times5}=\dfrac{12}{35}\)
\(\dfrac{2}{5}:\dfrac{2}{3}=\dfrac{2}{5}\times\dfrac{3}{2}=\dfrac{6}{10}=\dfrac{3}{5}\)
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3/11 x 2 = 6/11
6/11 : 3/11 = 2
6/11 : 2 = 3/11
2/3 x 11 = 22/3
4/2 x 7 = 14
8/7 : 2/7 = 4
8/7 : 4 = 2/7
2/7 x 4 = 8/7
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1/5x2/6x3/7x4/8 = 1/5x1/3x3/7x1/2 = (1/5x1/2) x (1/3x3/7) = 1/10 x 1/7 = 1/70
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4 x \(\frac{2}{7}\) = \(\frac{4x2}{7}\) = \(\frac{8}{7}\)
\(\frac{8}{7}\) : \(\frac{2}{7}\) = \(\frac{8}{7}\) x \(\frac{7}{2}\) = \(\frac{8x7}{7x2}\) = \(\frac{56}{14}\) = 4
\(\frac{8}{7}\) : 4 = \(\frac{8}{7x4}\) = \(\frac{8}{28}\) = \(\frac{2}{7}\)
\(\frac{2}{7}\) x 4 = \(\frac{2x4}{7}\) = \(\frac{8}{7}\)
tk mk nhé lưu kim linh
ai thấy đúng thì tk mk nha
cảm ơn các bn
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Ta có: \(\frac{5.3+6}{8.3+9}=\frac{15+6}{24+9}=\frac{21}{33}=\frac{7}{11}\)
\(\frac{4.4-6}{7.4-8}=\frac{16-6}{28-8}=\frac{10}{20}=\frac{1}{2}\)
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\(\frac{7}{9}+\frac{6}{7}\times\frac{4}{5}=\frac{7}{9}+\frac{24}{35}=\frac{361}{315}\)
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{16}{15}=\frac{548}{345}\)
\(\frac{5}{8}\times\frac{4}{9}:\frac{2}{3}=\frac{5}{18}:\frac{2}{3}=\frac{5}{12}\)
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{11}{24}\)
b,
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{4}{5}.\frac{8}{6}=\frac{21}{23}+\frac{16}{15}=1\frac{338}{345}\)
c,
\(\frac{5}{8}.\frac{4}{9}.\frac{3}{2}=\frac{5}{12}\)
d,
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{13}{24}\)
chán thật
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a) 2/5 + 3/4 = 23/20
b) 2/3 - 3/8 = 7/24
c) 3/7 x 4/5 = 12/35
d) 2/5 : 2/3 = 3/5
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a)
C1: 84 : (7 x 4) = 84 : 28 = 3
C2: 84 : (7 x 4) = 84 : 7 : 4 = 12 : 4 = 3
b)
C1: (15 x 36) : 6 = 540 : 6 = 90
C2: (15 x 36) : 6 = 15 x (36 : 6) = 15 x 6 = 90
Chúc em học tốt!!!
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\(\frac{8}{35}+\frac{2}{7}\times4\)
\(=\frac{8}{35}+\frac{8}{7}\)
\(=\frac{8}{35}+\frac{40}{35}\)
\(=\frac{48}{35}\)
4/5 nhé