Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Lời giải:
a. $\frac{5}{9}=\frac{5\times 2}{9\times 2}=\frac{10}{18}$
b. $\frac{9}{20}=\frac{9\times 3}{20\times 3}=\frac{27}{60}$
\(a,\dfrac{3}{9}=\dfrac{1}{3}\\ \dfrac{16 }{24}=\dfrac{2}{3}\\ b,\dfrac{17}{51}=\dfrac{1}{3}=\dfrac{5}{15}\\ \dfrac{18}{90}=\dfrac{1}{5}=\dfrac{3}{15}\\ c,\dfrac{5}{10}=\dfrac{1}{2}=\dfrac{3}{6}\\ \dfrac{15}{45}=\dfrac{1}{3}=\dfrac{2}{6}\\ d,\dfrac{42}{63}=\dfrac{2}{3}=\dfrac{6}{9}\\ \dfrac{64}{72}=\dfrac{8}{9}\)
a) \(3\times\dfrac{4}{11}=\dfrac{3\times4}{11}=\dfrac{12}{11}\)
b) \(1\times\dfrac{5}{4}=\dfrac{1\times5}{4}=\dfrac{5}{4}\)
c) \(0\times\dfrac{2}{5}=\dfrac{0\times2}{5}=\dfrac{0}{5}=0\)
a: \(=\dfrac{3\cdot4}{11}=\dfrac{12}{11}\)
b: \(=\dfrac{1\cdot5}{4}=\dfrac{5}{4}\)
c: \(=\dfrac{0\cdot2}{5}=0\)
\(\dfrac{1\times2}{5\times2}=\dfrac{2}{10}và\dfrac{7}{10};\dfrac{5\times3}{6\times3}=\dfrac{15}{18}.và.\dfrac{11}{18}\\ \dfrac{17}{28}và\dfrac{9\times2}{14\times2}=\dfrac{18}{28};\dfrac{12\times4}{25\times4}=\dfrac{48}{100}.và.\dfrac{47}{100}\)
a) \(\frac{9}{22}\cdot\frac{33}{8}=\frac{3^2\cdot3\cdot11}{2\cdot11\cdot2^3}=\frac{3^4}{2^4}=\frac{81}{16}\)
b) \(\frac{12}{35}:\frac{36}{35}=\frac{2^2\cdot3}{2^2\cdot3^2}=\frac{1}{3}\)
c) \(\frac{19}{17}:\frac{76}{51}=\frac{19\cdot3\cdot17}{17\cdot2^2\cdot19}=\frac{3}{4}\)
\(5:8=\dfrac{5}{8}\\ 7:12=\dfrac{7}{12}\\ 13:15=\dfrac{13}{15}\\ 12:17=\dfrac{12}{17}\\ 8:11=\dfrac{8}{11}\\ 6:13=\dfrac{6}{13}\\ 18:21=\dfrac{18}{21}=\dfrac{6}{7}\\ 15:23=\dfrac{15}{23}\)
a)
Phân số đã tối giản: \(\dfrac{2}{3}\); \(\dfrac{5}{17}\);\(\dfrac{1}{10}\)Phân số nào chưa tối giản: \(\dfrac{9}{21}\); \(\dfrac{10}{15}\); \(\dfrac{7}{14}\)
b) Rút gọn
\(\dfrac{21}{9}\) = \(\dfrac{7}{3}\)
\(\dfrac{10}{15}\) = \(\dfrac{2}{3}\)
\(\dfrac{7}{14}\) = \(\dfrac{1}{2}\)
a) Viết thương của mỗi phép chia sau dưới dạng phân số (theo mẫu).
13 : 17 = \(\dfrac{13}{17}\)
21 : 11 = \(\dfrac{22}{11}\)
40 : 51 = \(\dfrac{40}{51}\)
72 : 25 = \(\dfrac{72}{25}\)
b) Viết (theo mẫu)
34 : 17 = \(\dfrac{34}{17}\) = 2
20 : 5 =\(\dfrac{20}{5}\) = 4
42 : 42 = \(\dfrac{42}{42}\) = 1
0 : 6 = \(\dfrac{0}{6}\) = 0