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a)\(\dfrac{5}{7}+\dfrac{4}{9}=\dfrac{45}{63}+\dfrac{28}{63}=\dfrac{73}{63}\) ; \(\dfrac{9}{11}+\dfrac{3}{8}=\dfrac{72}{88}+\dfrac{33}{88}=\dfrac{105}{88}\)
\(\dfrac{4}{5}-\dfrac{2}{3}=\dfrac{12}{15}-\dfrac{10}{15}=\dfrac{2}{15}\); \(\dfrac{16}{25}-\dfrac{2}{5}=\dfrac{16}{25}-\dfrac{10}{25}=\dfrac{6}{25}\)
b)\(5+\dfrac{3}{5}=\dfrac{25}{5}+\dfrac{3}{5}=\dfrac{28}{5};10-\dfrac{9}{16}=\dfrac{160}{16}-\dfrac{9}{16}=\dfrac{151}{16}\)
\(\dfrac{2}{3}-\left(\dfrac{1}{6}+\dfrac{1}{8}\right)=\dfrac{2}{3}-\left(\dfrac{8}{48}+\dfrac{6}{48}\right)=\dfrac{2}{3}-\dfrac{14}{48}=\dfrac{32}{48}-\dfrac{14}{48}=\dfrac{3}{8}\)
a) 1/2 = 2/4 = 3/6 = 4/8 = 5/10
b) 1/3 = 2/6 = 3/9 = 4/12 = 5/15
c) 3/4 = 6/8 = 9/12 = 12/16 = 18/24
d) 4/3 = 8/6 = 12/9 = 16/12 = 20/15
e) 6/4 = 3/2 ; 6/3 = 4/2
g) 4/2 12/6 = 24/12
Bài 1: Tính
\(a.\frac{15}{16}-\frac{7}{16}=\frac{15-7}{16}=\frac{8}{16}=\frac{1}{2}\)
\(b.\frac{7}{4}-\frac{3}{4}=\frac{7-3}{4}=\frac{4}{4}=1\)
\(c.\frac{9}{5}-\frac{3}{5}=\frac{9-3}{5}=\frac{6}{5}\)
\(d.\frac{17}{49}-\frac{12}{49}=\frac{17-12}{49}=\frac{5}{49}\)
Bài 2:Rút gọn rồi tính
\(a.\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{2-1}{3}=\frac{1}{3}\)
\(b.\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{7-3}{5}=\frac{4}{5}\)
Học tốt. K cho mik nha
\(a)\frac{2}{3}+\frac{7}{12}=\frac{8+7}{12}=\frac{15}{12}\)
\(\frac{25}{48}+\frac{11}{24}=\frac{25+22}{48}=\frac{47}{48}\)
P/S : Giải từng bài
\(b)\frac{5}{7}+\frac{3}{18}=\frac{5}{7}+\frac{1}{6}=\frac{30+7}{42}=\frac{37}{42}\)
\(\frac{15}{24}+\frac{12}{16}=\frac{5}{8}+\frac{3}{4}=\frac{5+6}{8}=\frac{11}{8}\)
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.
😁😁😁
4
Giải : Một cạnh của hình vuông là : 24/5 : 4 = 24/20 = 6/5 ( m )
Diện tích hình vuông đó là : 6/5 x 6/5 = 36/25 ( m2 )
Đáp số : 36/25 m2
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 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/ \(\frac{5}{12}+\left(\frac{3}{4}+\frac{2}{3}\right):\frac{34}{3}=\frac{5}{12}+\frac{17}{12}:\frac{34}{3}=\frac{5}{12}+\frac{1}{8}=\frac{13}{24}\)
có cần chi tiết ko bn
ko chỉ cần tính thôi bn ko cần chi tiết
109/60
14/15
53/63
7/8
2/5
Mai cô mik chữa mà mik sai thì... ko soa
a, 2/5 + 2/3 + 3/4=109/60
b, 8/5 - 18/27=14/15
c, 2/7 + 5/9=53/63
d, 5/16 + 7/16 + 3/24=7/8
e, 2/3 - 4/15=2/5
\(a,\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{3}{4}=\left(\dfrac{2}{5}+\dfrac{2}{3}\right)+\dfrac{3}{4}=\dfrac{16}{5}+\dfrac{3}{4}=\dfrac{109}{60}\)
\(b,\dfrac{8}{5}-\dfrac{18}{27}=\dfrac{216}{135}-\dfrac{90}{135}=\dfrac{126}{135}=\dfrac{14}{15}\)
\(c,\dfrac{2}{7}+\dfrac{5}{9}=\dfrac{18}{63}+\dfrac{35}{63}=\dfrac{53}{63}\)
\(d,\dfrac{5}{16}+\dfrac{7}{16}+\dfrac{3}{24}=\left(\dfrac{5}{16}+\dfrac{7}{16}\right)+\dfrac{3}{24}=\dfrac{3}{4}+\dfrac{3}{24}=\dfrac{7}{8}\)
\(e,\dfrac{2}{3}-\dfrac{4}{15}=\dfrac{10}{15}-\dfrac{4}{15}=\dfrac{6}{15}=\dfrac{2}{5}\)