5 phần ? = 15 phần 24
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)27-x/15=5/3
=>27-x/15=25/15
=>27-x=25
=>x=27-25
=>x=2
Vậy x = 2
b)5+x/7 = 24/21
=>5+x/7=8/7
=>5+x=8
=>x=8-5
=>x=3
Vậy x= 3
27 - \(\frac{x}{15}\) = \(\frac{5}{3}\)
\(\frac{x}{15}\) = 27 - \(\frac{5}{3}\)
\(\frac{x}{15}\) = \(\frac{76}{3}\)
Phần b lm tương tự nha !!
![](https://rs.olm.vn/images/avt/0.png?1311)
a 25 phần 41
b 9
c 1 phần 12
d 12
e 14 phần 15
f 24 phần 7
![](https://rs.olm.vn/images/avt/0.png?1311)
Rút gọn rồi tính: \(a.\frac{16}{24}-\frac{1}{3}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)
\(b.\frac{4}{5}-\frac{12}{60}=\frac{4}{5}-\frac{1}{5}=\frac{3}{5}\)
Tính rồi rút gọn:
\(a.\frac{17}{6}-\frac{2}{6}=\frac{15}{6}\)
\(b.\frac{16}{15}-\frac{11}{15}=\frac{5}{15}=\frac{1}{3}\)
\(c.\frac{19}{12}-\frac{13}{12}=\frac{6}{12}=\frac{1}{2}\)
1a2/3-1/3=1/3 c4/5-1/5=3/5 tinh roi rut gon 17/6-2/6=15/6=5/2 16/15-11/15=5/15=1/3 19/12-13/12=6/12=1/2
chuc bn hoc tot
![](https://rs.olm.vn/images/avt/0.png?1311)
c1
a,3/15 = 3:3/15:3 = 15
33/44 = 33:11/44:11 = 34
2/8 = 2:2/8:2 = 1/4
b,9/12 =9:3/12:3 = 34
24/36 =24:12/36:12 = 23
3/8 = 3:1/8:1 = 3/8
c2
a) =12x(4+6)/24
= 12x10/24
=120/24
=5
b,16x8-16x2/12x4
=16x(8-2)/48
=16x6/48
=2
c3
5/8=45/72
20/15=4/3=96/72
24/32=3/4=54/72
15/18=5/6=60/72
77/99=7/9=56/72
c4
2/3=2/3
12/15=4/5
24/18=4/3
16/48=1/3
75/100=3/4
30/45=2/3
12/36=1/3
20/15=4/3
các phân số lớn hơn 1 luôn có mẫu số bé hơn tử số
vậy các số lớn hơn 1 là 24/18,20/15
k mk nha thank mọi ng'
a, \(\frac{3}{15}=\frac{1}{5}=\frac{4}{20}\); \(\frac{33}{44}=\frac{3}{4}=\frac{15}{20}\); \(\frac{2}{8}=\frac{1}{4}=\frac{5}{20}\)
b, \(\frac{9}{12}=\frac{3}{4}=\frac{18}{24}\); \(\frac{24}{36}=\frac{2}{3}=\frac{16}{24}\); \(\frac{3}{8}=\frac{9}{24}\)
Bài 2 :
a,\(\frac{12x4+12x6}{24}=\frac{12x\left(4+6\right)}{24}=\frac{1x10}{2}=\frac{10}{2}=\frac{5}{1}\)
b, \(\frac{16x8-16x2}{12}=\frac{16x\left(8-2\right)}{12}=\frac{8x6}{6}=\frac{8}{1}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(25\frac{4}{9}-14\frac{6}{13}\right)-\left(24\frac{7}{13}-15\frac{5}{9}\right)\)
\(=\left(24\frac{7}{13}-14\frac{6}{13}\right)-\left(25\frac{4}{9}-15\frac{5}{9}\right)\)
\(=\frac{131}{13}-\frac{89}{9}\)
\(=\frac{22}{117}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{x}{7}=\frac{6}{28}\Rightarrow x=\frac{6.7}{28}\Rightarrow x=\frac{3}{2}\)
Vậy \(x=\frac{3}{2}\)
b) \(\frac{-5}{y}=\frac{15}{24}\Rightarrow y=\frac{\left(-5\right).24}{15}\Rightarrow y=-8\)
Vậy \(y=-8\)
c) \(\frac{x}{-3}=\frac{4}{12}\Rightarrow x=\frac{\left(-3.\right).4}{12}\Rightarrow x=-1\)
Vậy \(x=-1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{4}+\frac{3}{5}=\frac{17}{20}\)
\(\frac{5}{2}+\frac{7}{9}=\frac{59}{18}\)
\(\frac{3}{2}+\frac{2}{3}=\frac{13}{6}\)
\(\frac{4}{5}+\frac{3}{2}=\frac{23}{10}\)
\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=1\)
\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=2\)
\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{10}{6}=\frac{5}{3}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)
_HT_
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{4}{5}\); \(\dfrac{3}{4}\); \(\dfrac{11}{13}\)
b) \(\dfrac{25}{35}\); \(\dfrac{100}{140}\); \(\dfrac{85}{119}\)
a) Những phân số tối giản là: \(\dfrac{4}{5};\dfrac{3}{4};\dfrac{11}{13}\)
b) Những phân số bằng \(\dfrac{5}{7}\) là: \(\dfrac{25}{35};\dfrac{100}{140};\dfrac{16}{28};\dfrac{85}{119}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(\frac{3}{8};-\frac{7}{11}\)
Quy đồng mẫu số: \(\frac{3}{8}=\frac{3\cdot11}{8\cdot11}=\frac{33}{88};-\frac{7}{11}=\frac{-7\cdot8}{11\cdot8}=-\frac{56}{88}\)
b, \(\frac{7}{15};-6\)
Quy đồng mẫu số: \(-6=\frac{-6\cdot15}{15}=-\frac{90}{15}\)
c, \(-\frac{3}{16};\frac{-5}{-24}\) ; \(-\frac{21}{56}\)
Quy đồng mẫu số:
\(-\frac{3}{16}=\frac{-3\cdot3}{16\cdot3}=-\frac{9}{48};\frac{-5}{-24}=\frac{5}{24}=\frac{5\cdot2}{24\cdot2}=\frac{10}{48}\)
\(-\frac{21}{56}=-\frac{3}{8}=\frac{-3\cdot6}{8\cdot6}=-\frac{18}{48}\)
TL
\(\frac{5}{8}=\frac{15}{24}\)
HT Ạ
@@@@@@@@@@@@@
\(\frac{5}{8}=\frac{15}{24}\)
*Vì:
- Ta rút gọn \(\frac{15}{24}=\frac{5}{8}\)
\(\Rightarrow\frac{5}{?}=\frac{5}{8}\)
\(?=8\)