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1/2 + 1/3 + 5/9
\(=\dfrac{27}{54}+\dfrac{28}{54}\) + \(\)\(\dfrac{30}{54}\)
= 85/54
HT
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\(\frac{1}{2}+\frac{1}{3}\cdot\frac{1}{5}:\frac{2}{3}\)
\(=\frac{1}{2}+\frac{1}{3}\cdot\frac{3}{10}\)
\(=\frac{1}{2}+\frac{1}{10}\)
\(=\frac{3}{5}\)
chúc bạn học tốt nhé ^..^
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a, 3/22 x 3/11 x 22
Cách 1
3/22 x 3/11 x 22 = 9/242 x 22
= 198/242
= 9/11
Cách 2
3/22 x 3/11 x 22 = 3 x 3 x 22/22 x 11 x 1
= 9/11
b,( 1/2 + 1/3) x 2/5
Cách 1
( 1/2 + 1/3 ) x 2/5 = 5/6 x 2/5
= 10/30
= 1/3
Cách 2
( 1/2 +1/3) x 2/5 = 1/2 x 2/5 + 1/3 x 2/5
= 2/10 + 2/15
= 1/5 + 2/15
= 3/15 + 2/15
= 5/15
= 1/3
c, 3/5 x 17/21 + 17/21 x 2/5
Cách 1
3/5 x 17/21 + 17/21 x 2/5 = 51/105 + 34/105
= 85/105
= 17/21
Cách 2
3/5 x 17/21 + 17/21 x 2/5 = 17/21 x (3/5 +2/5)
= 17/21 x 5/5
= 17/21 x 1
= 17/21
HỌC TỐT ( k mk nhé)
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\(\frac{1}{2}+\frac{2}{5}=\frac{1x5}{2.5}+\frac{2x2}{5.2}=\frac{5}{10}+\frac{4}{10}=\frac{9}{10}\)
HT nhé
TL
\(\frac{1}{2}+\frac{2}{5}=\frac{5}{10}+\frac{4}{10}=\frac{9}{10}\)
HT Ạ
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