rút gọn các phân số
a) 22/55 b) -63/81
:)
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OY
24 tháng 7 2021
a) \(\dfrac{22}{55}=\dfrac{2}{5}\)
b) \(\dfrac{-63}{81}=\dfrac{-7}{9}\)
c) \(\dfrac{2.14}{7.8}=\dfrac{2.7.2}{7.2.2.2}=\dfrac{1}{2}\)
d) \(\dfrac{49+7.49}{49}=\dfrac{49.\left(7+1\right)}{49}=\dfrac{49.8}{49}=8\)
H
4 tháng 2 2023
\(a,\dfrac{52}{32}=\dfrac{13}{8}\\ \dfrac{55}{65}=\dfrac{11}{13}\\ MSC:104\\ =>\dfrac{13}{8}=\dfrac{13.13}{8.13}=\dfrac{169}{104}\\ \dfrac{11}{13}=\dfrac{11.8}{13.8}=\dfrac{88}{104}\)
\(b,\dfrac{72}{64}=\dfrac{9}{8}\\ \dfrac{54}{81}=\dfrac{2}{3}\\ MSC:24\\ \dfrac{9}{8}=\dfrac{9.3}{8.3}=\dfrac{27}{24}\\ \dfrac{2}{3}=\dfrac{2.8}{3.8}=\dfrac{16}{24}\\ c,\dfrac{24}{36}=\dfrac{2}{3}\\ \dfrac{12}{30}=\dfrac{2}{5}\\ MSC:15\\ \dfrac{2}{3}=\dfrac{2.5}{3.5}=\dfrac{10}{15}\\ \dfrac{2}{5}=\dfrac{2.3}{3.5}=\dfrac{6}{15}\)
\(d,\dfrac{80}{40}=2\\ \dfrac{45}{63}=\dfrac{5}{7}\\ MSC:7\\ 2=\dfrac{14}{7}\\ e,\dfrac{150}{50}=3\\ \dfrac{100}{200}=\dfrac{1}{2}\\ MSC:2\\ 3=\dfrac{6}{2}\\ f,\dfrac{54}{81}=\dfrac{2}{3}\\ \dfrac{69}{93}=\dfrac{23}{21}\\ MSC:21\\ \dfrac{2}{3}=\dfrac{2.7}{3.7}=\dfrac{14}{21}\)
4 tháng 2 2023
\(a.\dfrac{52}{32}\text{=}\dfrac{13}{8};\dfrac{55}{65}\text{=}\dfrac{11}{13}\)
\(\dfrac{13.13}{13.8}\text{=}\dfrac{169}{104};\dfrac{11.8}{13.8}\text{=}\dfrac{88}{104}\)
\(c.\dfrac{24}{36}\text{=}\dfrac{2}{3};\dfrac{12}{30}\text{=}\dfrac{2}{5}\)
\(\dfrac{2.5}{3.5}\text{=}\dfrac{10}{15};\dfrac{2.3}{5.3}\text{=}\dfrac{6}{15}\)
\(b.\dfrac{72}{64}\text{=}\dfrac{9.3}{8.3}\text{=}\dfrac{27}{24};\dfrac{54}{81}\text{=}\dfrac{2.8}{3.8}\text{=}\dfrac{16}{24}\)
\(d.\dfrac{80}{40}\text{=}\dfrac{2.63}{63}\text{=}\dfrac{126}{63};\dfrac{45}{63}\)
\(e.\dfrac{150}{50}\text{=}\dfrac{3.2}{2}\text{=}\dfrac{6}{2};\dfrac{100}{200}\text{=}\dfrac{1}{2}\)
\(f.\dfrac{54}{81}\text{=}\dfrac{2.31}{3.31}\text{=}\dfrac{62}{93};\dfrac{69}{93}\)
24 tháng 7 2018
Bài 1 :
\(\frac{22}{55}=\frac{22:11}{55:11}=\frac{2}{5}\)
\(\frac{63}{81}=\frac{63:9}{81:9}=\frac{7}{9}\)
Bài 2 :
\(\frac{3}{16}=\frac{3\times24\times56}{16\times24\times56}=\frac{4032}{21504}\)
\(\frac{5}{24}=\frac{5\times16\times56}{24\times16\times56}=\frac{4480}{21504}\)
\(\frac{21}{56}=\frac{21\times24\times16}{56\times24\times16}=\frac{8064}{21504}\)
Học tốt # ^-<
28 tháng 5 2022
\(\dfrac{18}{45}=\dfrac{2}{5}\dfrac{63}{81}=\dfrac{7}{9}\) minh chi co the lam the nay thoi vi minh dang co viec gap
TT
5
T
22 tháng 2 2018
a) \(\frac{\left(-63\right)}{81}=\frac{\left(-63\right):9}{81:9}=\frac{-7}{9}\)
b) \(\frac{-25}{-75}=\frac{\left(-25\right):25}{\left(-75\right):25}=\frac{-1}{-3}=\frac{1}{3}\)
22 tháng 2 2018
\(a.\frac{-63}{81}=\frac{-7}{9}\)
\(b.\frac{-25}{-75}=\frac{1}{3}\)
AD
2
D
31 tháng 3 2018
\(a,\frac{45}{60}=\frac{45:15}{60:15}=\frac{3}{4}\)
\(b,\frac{39}{12}=\frac{39:3}{12:3}=\frac{13}{4}\)
\(c,\frac{81}{90}=\frac{81:9}{90:9}=\frac{9}{10}\)
\(d,\frac{360}{720}=\frac{360:360}{720:360}=\frac{1}{2}\)
\(e,\frac{24}{20}=\frac{24:4}{20:4}=\frac{6}{5}\)
\(g,\frac{66}{65}=\frac{66}{65}\)
\(...,\frac{66}{55}=\frac{66:11}{55:11}=\frac{6}{5}\)
31 tháng 3 2018
a) 45/60 = 3/4
b) 39/12 = 13/4
c) 81/90 = 9/10
d) 360/720 = 1/2
e) 24/20 = 6/5
g) 66/65 = 66/65
h) 66/55 = 6/5
mik nha !~
NA
26 tháng 2 2022
\(\dfrac{75}{100}=\dfrac{3}{4};\dfrac{63}{126}=\dfrac{1}{2}\\ \dfrac{36}{27}=1\dfrac{1}{3};\dfrac{81}{54}=1\dfrac{1}{2};\dfrac{105}{405}=\dfrac{7}{27}\)
rút gọn các phân số
a) 22/55 = 2/5
b) -63/81 = -7/9
\(\frac{22}{55}=\frac{22:11}{55:11}=\frac{2}{5}\)
\(-\frac{63}{81}=-\frac{63:9}{81:9}=-\frac{7}{9}\)