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\(\frac{2}{7}+\frac{7}{12}=\frac{24}{84}+\frac{49}{84}=\frac{73}{84}\)
\(\frac{25}{48}+\frac{22}{48}=\frac{47}{48}\)
\(\frac{5}{7}+\frac{3}{8}=\frac{40}{56}+\frac{21}{56}=\frac{61}{56}\)
\(\frac{15}{24}+\frac{15}{16}=15.\left(\frac{1}{24}+\frac{1}{16}\right)=\frac{25}{16}\)
\(\frac{5}{6}+\frac{3}{4}=\frac{20+18}{24}=\frac{19}{12}\)
\(\frac{9}{24}+\frac{14}{24}=\frac{23}{24}\)
học tót tích mình hem
a 7/15 + (5/6 - 1/3) = 7/15 + 1/2 = 14/30 + 15/30 = 29/30
b 4/7 *21/16 : 5/8 = 3/4 : 5/8 = 6/5
c 15/8 - 4/9 * 6/8+ 1/6 =15/8 - 1/3 + 1/6 = 37/24 + 1/6 = 41/24
d 5/12+(3/4 + 2/3 ) : 34/3 =
a/\(\frac{7}{15}+\left(\frac{5}{6}-\frac{1}{3}\right)=\frac{7}{15}+\frac{1}{2}=\frac{29}{30}\)
b/\(\frac{4}{7}\cdot\frac{21}{16}:\frac{5}{8}=\frac{4}{7}\cdot\frac{2}{16}\cdot\frac{8}{5}=\frac{4}{35}\)
c/\(\frac{15}{8}-\frac{4}{9}\cdot\frac{6}{8}+\frac{1}{6}=\frac{15}{8}-\frac{1}{3}+\frac{1}{6}=\frac{41}{24}\)
d/ \(\frac{5}{12}+\left(\frac{3}{4}+\frac{2}{3}\right):\frac{34}{3}=\frac{5}{12}+\frac{17}{12}:\frac{34}{3}=\frac{5}{12}+\frac{1}{8}=\frac{13}{24}\)
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
a) 25/48 + 11/24 = 25/48 + 22/48 = 47/48
b) 5/7 + 3/18 = 5/7 + 1/6 = 30/42 + 7/42 = 37/42
c) 15/24 + 12/16 = 5/8 + 6/8 = 11/8
d) 5/8 + 3/5 = 25/40 + 24/40 = 49/40
e) 4/7 + 3/5 = 20/35 + 21/35 = 41/35
Chúc bạn học tốt.
😁😁😁
Bài 1:
\(\frac{1}{12},\frac{2}{3},\frac{3}{4},\frac{5}{6}\)
Bài 2:
A. \(\frac{11}{6}\)
B. \(\frac{3}{32}\)
C. \(\frac{1}{7}\)
D. \(\frac{15}{8}\)
Tích đúng cho mình nhé!
\(a)\frac{2}{3}+\frac{7}{12}=\frac{8+7}{12}=\frac{15}{12}\)
\(\frac{25}{48}+\frac{11}{24}=\frac{25+22}{48}=\frac{47}{48}\)
P/S : Giải từng bài
\(b)\frac{5}{7}+\frac{3}{18}=\frac{5}{7}+\frac{1}{6}=\frac{30+7}{42}=\frac{37}{42}\)
\(\frac{15}{24}+\frac{12}{16}=\frac{5}{8}+\frac{3}{4}=\frac{5+6}{8}=\frac{11}{8}\)
2/3 + 7/1 = 2/3 + 7 = 2/3 + 21/3 = 23/3
25/48 + 11/24 = 25/48 + 22/48 = 47/48
5/7 + 3/8 = 40/56 + 21/56 = 61/56
15/24 + 12/6 = 5/8 + 2 = 5/8 + 16/8 = 21/8
5/6 + 4/3 = 5/6 + 8/6 = 13/6
3/8 + 7/12 = 9/24 + 14/24 = 23/24
a,5/7+3/8=.....61/56.........
15/24+12/16=.....11/8......
b,5/6+3/4=...19/12......
3/8+7/12=...23/24........
Hok tốt
a) 5/7 + 3/8 = 40/56 + 21/56 = 61/56
15/24 + 12/16 = 15/24 + 16/24 = 31/24
b) 5/6 + 3/4 = 10/12 + 9/12 = 19/12
3/8 + 7/12 = 9/24 + 14/24 = 23/24
k cho mik nha hok tot