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4/6 + 3 = \(\frac{11}{3}\)
3/5 x 7/4 - 1/3 = \(\frac{43}{60}\)
9/8 - 1/7 = \(\frac{55}{56}\)
2 : 34/6 = \(\frac{6}{17}\)
Học tốt
\(\frac{4}{6}+3=3\frac{4}{6}\)
\(\frac{3}{5}\cdot\frac{7}{4}-\frac{1}{3}=\frac{21}{20}-\frac{1}{3}=\frac{63-20}{60}=\frac{43}{60}\)
\(\frac{9}{8}-\frac{1}{7}=\frac{63-8}{56}=\frac{55}{56}\)
\(2:\frac{34}{6}=2\cdot\frac{6}{34}=\frac{6}{17}\)
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nội quy hỏi đáp của học24
1 ko đưa linh tinh lên diễn đàn
2 ko đúng vào câu hỏi linh tinh nhằm gian lận điểm hỏi đáp
3 ko trả lời linh tinh,ko phù hợp với nội dung trên diên đàn
báo cáo nhé bạn
e: \(\dfrac{17}{5}:x=\dfrac{34}{5}:\dfrac{4}{3}=\dfrac{34}{5}\cdot\dfrac{3}{4}=\dfrac{102}{20}=\dfrac{51}{10}\)
\(\Leftrightarrow x=\dfrac{17}{5}:\dfrac{51}{10}=\dfrac{17}{5}\cdot\dfrac{10}{51}=\dfrac{10}{5}\cdot\dfrac{17}{51}=2\cdot\dfrac{1}{3}=\dfrac{2}{3}\)
f: \(x:\dfrac{4}{5}=\dfrac{25}{8}:\dfrac{5}{4}=\dfrac{25}{8}\cdot\dfrac{4}{5}=\dfrac{100}{40}=\dfrac{5}{2}\)
\(\Leftrightarrow x=\dfrac{5}{2}\cdot\dfrac{4}{5}=\dfrac{4}{2}=2\)
g: \(\left(0.25x+2012\right)\cdot2013=\left(50+2012\right)\cdot2013\)
\(\Leftrightarrow0.25x+2012=50+2012\)
\(\Leftrightarrow0.25x=50\)
hay x=200
h: \(\left(x-\dfrac{1}{2}\right)\cdot\dfrac{5}{3}=\dfrac{7}{4}-1=\dfrac{3}{4}\)
\(\Leftrightarrow x-\dfrac{1}{2}=\dfrac{3}{4}:\dfrac{5}{3}=\dfrac{9}{20}\)
\(\Leftrightarrow x=\dfrac{9}{20}+\dfrac{1}{2}=\dfrac{9}{20}+\dfrac{10}{20}=\dfrac{19}{20}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{2}{5}\times15\dfrac{1}{3}-\dfrac{2}{5}\times10\dfrac{1}{3}\)
\(=\dfrac{2}{5}\times\left(15\dfrac{1}{3}-10\dfrac{1}{3}\right)\)
\(=\dfrac{2}{5}\times5\)
\(=2\)
____________________
\(12\dfrac{5}{11}-\left(3\dfrac{1}{4}+2\dfrac{5}{11}\right)\)
\(=12\dfrac{5}{11}-3\dfrac{1}{4}-2\dfrac{5}{11}\)
\(=\left(12\dfrac{5}{11}-2\dfrac{5}{11}\right)-3\dfrac{1}{4}\)
\(=10-3\dfrac{1}{4}\)
\(=\dfrac{27}{4}\)
_______________
\(\dfrac{34}{31}-\dfrac{19}{28}-\dfrac{3}{31}\)
\(=\left(\dfrac{34}{31}-\dfrac{3}{31}\right)-\dfrac{19}{28}\)
\(=\dfrac{31}{31}-\dfrac{19}{28}\)
\(=1-\dfrac{19}{28}\)
\(=\dfrac{9}{28}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 : Tính
a) 4 - 5/7 = .....23/7.............
b) 1/2 : 3 = ......1/6........................
c) 266,22 : 34 = ..............7,83............
d) 7/9 + 9/10 = ......151/90...................
e) 3 và 1/2 : 2 và 1/4 = .....14/9...........
g) 21,76 x 2,05 =....44,608......................
h) 75,95 : 3,5 = .........21,7...................
i) 5/6 + 7/12 = .......17/12...................
k) 3 - 5/7 = .....16/7...................
Bài 1 : Tính
a) 4 - 5/7 = 23/7.
b) 1/2 : 3 = 1/6.
c) 266,22 : 34 = 783/100
d) 7/9 + 9/10 = 151/90
e) 3 và 1/2 : 2 và 1/4 = 3
g) 21,76 nhân 2,05 =.5576/125
h) 75,95 : 3,5 = 217/10
i) 5/6 + 7/12 = 97/102
k) 3 - 5/7 = 16/7
![](https://rs.olm.vn/images/avt/0.png?1311)
a) = 29/15
b) = 7/15
c) = 1
d) = 3
e) = 67/17
f) = 2
mk nhanh nhất tk cho mk nha
a/\(\frac{3}{5}+\frac{4}{3}=\frac{9}{15}+\frac{20}{15}=\frac{29}{15}\)
b/\(\frac{2}{3}-\frac{1}{5}=\frac{10}{15}-\frac{3}{15}=\frac{7}{15}\)
c/\(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=\frac{3}{6}+\frac{2}{6}+\frac{1}{6}=\frac{7}{6}\)
d,\(\frac{3}{5}+\frac{4}{7}+\frac{7}{5}+\frac{3}{7}=\left(\frac{3}{5}+\frac{7}{5}\right)+\left(\frac{4}{7}+\frac{3}{7}\right)=2+1=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5 - 1/3 + 1/4 - 2/5
= 300/60 - 20/60 + 15/60 - 24/60
= 271/60
3+1/7-34
= 21/7 + 1/7 - 238/7
= -216/7
lớp 5 học âm ??????