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5/7:15/28=4/3
9/11:21/22=6/7
7/9:5/6=14/15
8/15:16/25=5/6
k cho mình nhé
5/6 + 9/12 : 18/5 = 5/6 + 3/4 : 18/5
= 5/6 + 3/4 x 5/18
= 5/6 + 15/72
= 5/6 + 5/24
= 20/24 + 5/24
= 25/24
5/7 + 9/8 - 15/28 = 40/56 + 63/56 - 30/56
= 103/56 - 30/56
= 73/56
\(\dfrac{5}{6}+\dfrac{9}{12}:\dfrac{18}{5}\)
\(=\dfrac{5}{6}+\dfrac{5}{24}\)
\(=\dfrac{25}{24}\)
\(---\)
\(\dfrac{5}{7}+\dfrac{9}{8}-\dfrac{15}{28}\)
\(=\dfrac{103}{56}-\dfrac{15}{28}\)
\(=\dfrac{73}{56}\)
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
1.Ta có: \(\frac{5}{8}\)= \(\frac{5.5}{8.5}\)= \(\frac{25}{40}\)
\(\frac{4}{5}\)= \(\frac{4.8}{5.8}\)= \(\frac{32}{40}\)
\(\Rightarrow\)Tấm vải 2 dài hơn tấm vải 1
2.\(\frac{7}{9}\)> \(\frac{7}{11}\)
\(\frac{6}{13}\) > \(\frac{12}{28}\)
\(\frac{15}{8}\)< \(\frac{15}{7}\)
\(\frac{35}{63}\)= \(\frac{5}{9}\)
1
\(\text{ta có: }\frac{5}{8}=\frac{5\times5}{8\times5}=\frac{25}{40}\text{ và }\frac{4}{5}=\frac{4\times8}{5\times8}=\frac{32}{40}\)
\(\Rightarrow\frac{5}{8}< \frac{4}{5}\left(\frac{25}{40}< \frac{32}{40}\right)\)
\(\Rightarrow\) mảnh vải đỏ dài hơn
2
7/9 >7/11
6/13 >12/28
15/8 <15/7
35/63 = 5/9
\(\text{# học tốt #}\)
5/7+9/8-15/28=1/17/56
\(\frac{5}{7}+\frac{9}{8}-\frac{15}{28}\)
\(=\frac{40}{56}+\frac{63}{56}-\frac{30}{56}\)
\(=\frac{40+63-30}{56}\)
\(=\frac{73}{56}\)