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Như vậy kết quả sẽ nhỏ hơn đấy
2/3 + 3/4=17/12
9/4 + 3/5=57/20
5/24 + 1/4=11/24
3/15 - 5/35=2/35 18/27 - 2/6=1/3 37/12 - 3=1/12
11/9 x 3/22=1/6 7/13 x 13/7=1 4 x6/7=24/7
2/5 : 3/10=4/3 3/8 : 9/4=1/6 8/21 : 4/7=2/3
\(\dfrac{5}{8}+\dfrac{7}{24}\) = \(\dfrac{15}{24}\) + \(\dfrac{7}{24}\) = \(\dfrac{22}{24}\) = \(\dfrac{11}{12}\)
\(\dfrac{6}{5}+\dfrac{9}{30}=\dfrac{36}{30}+\dfrac{9}{30}=\dfrac{45}{30}=\dfrac{3}{2}\)
\(\dfrac{7}{12}\) + \(\dfrac{5}{2}\) = \(\dfrac{7}{12}+\dfrac{30}{12}=\dfrac{37}{12}\)
\(\dfrac{9}{21}\) + \(\dfrac{6}{49}\) = \(\dfrac{3}{7}\) + \(\dfrac{6}{49}\) = \(\dfrac{21}{49}\) + \(\dfrac{6}{49}\) = \(\dfrac{27}{49}\)
= 1 - 6/9:3/4 +12/24x4/7
= 1 - 2/9 x 4 + 2/7
=1-8/9+ 2/7
=25 / 63
k cho mik nha ! Phan Thuỳ Linh #$%
\(\frac{7}{9}+\frac{6}{7}\times\frac{4}{5}=\frac{7}{9}+\frac{24}{35}=\frac{361}{315}\)
\(\frac{21}{23}+\frac{4}{5}:\frac{6}{8}=\frac{21}{23}+\frac{16}{15}=\frac{548}{345}\)
\(\frac{5}{8}\times\frac{4}{9}:\frac{2}{3}=\frac{5}{18}:\frac{2}{3}=\frac{5}{12}\)
\(\frac{7}{12}+\frac{5}{6}-\frac{21}{24}=\frac{14}{24}+\frac{20}{24}-\frac{21}{24}=\frac{11}{24}\)
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
Bài 1:
a)\(\frac{12}{33}\)\(< \)\(\frac{16}{33}\)(So sánh tử)
b) \(\frac{2}{5}\)=\(\frac{4}{10}\)\(>\)\(\frac{3}{10}\)(Quy đồng mẫu, so sánh tử)
Bài 2:
a)\(\frac{17}{24}+\frac{7}{24}=\frac{24}{24}=1\)
b) \(\frac{3}{5}+\frac{5}{3}=\frac{9}{15}+\frac{25}{15}=\frac{34}{15}\)
Bài 3:
a)\(\frac{7}{4}-\frac{3}{4}=\frac{4}{4}=1\)
b)\(\frac{21}{24}-\frac{6}{8}=\frac{21}{24}-\frac{18}{24}=\frac{3}{24}=\frac{1}{8}\)