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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
\(a.\dfrac{52}{32}\text{=}\dfrac{13}{8};\dfrac{55}{65}\text{=}\dfrac{11}{13}\)
\(\dfrac{13.13}{13.8}\text{=}\dfrac{169}{104};\dfrac{11.8}{13.8}\text{=}\dfrac{88}{104}\)
\(c.\dfrac{24}{36}\text{=}\dfrac{2}{3};\dfrac{12}{30}\text{=}\dfrac{2}{5}\)
\(\dfrac{2.5}{3.5}\text{=}\dfrac{10}{15};\dfrac{2.3}{5.3}\text{=}\dfrac{6}{15}\)
\(b.\dfrac{72}{64}\text{=}\dfrac{9.3}{8.3}\text{=}\dfrac{27}{24};\dfrac{54}{81}\text{=}\dfrac{2.8}{3.8}\text{=}\dfrac{16}{24}\)
\(d.\dfrac{80}{40}\text{=}\dfrac{2.63}{63}\text{=}\dfrac{126}{63};\dfrac{45}{63}\)
\(e.\dfrac{150}{50}\text{=}\dfrac{3.2}{2}\text{=}\dfrac{6}{2};\dfrac{100}{200}\text{=}\dfrac{1}{2}\)
\(f.\dfrac{54}{81}\text{=}\dfrac{2.31}{3.31}\text{=}\dfrac{62}{93};\dfrac{69}{93}\)
NA
26 tháng 2 2022
\(\dfrac{75}{100}=\dfrac{3}{4};\dfrac{63}{126}=\dfrac{1}{2}\\ \dfrac{36}{27}=1\dfrac{1}{3};\dfrac{81}{54}=1\dfrac{1}{2};\dfrac{105}{405}=\dfrac{7}{27}\)
NV
Nguyễn Việt Lâm
Giáo viên
15 tháng 2 2022
\(\dfrac{90}{120}=\dfrac{30.3}{30.4}=\dfrac{3}{4}\)
\(\dfrac{15}{25}=\dfrac{5.3}{5.5}=\dfrac{3}{5}\)
\(\dfrac{18}{45}=\dfrac{9.2}{9.5}=\dfrac{2}{5}\)
\(\dfrac{36}{64}=\dfrac{4.9}{4.16}=\dfrac{9}{16}\)
\(\dfrac{32}{72}=\dfrac{8.4}{8.9}=\dfrac{4}{9}\)
\(\dfrac{84}{49}=\dfrac{7.12}{7.7}=\dfrac{12}{7}\)
15 tháng 2 2022
\(\dfrac{90}{120}=\dfrac{3}{4};\dfrac{15}{25}=\dfrac{3}{5};\dfrac{18}{45}=\dfrac{2}{5};\dfrac{36}{64}=\dfrac{9}{16};\dfrac{32}{72}=\dfrac{4}{9};\dfrac{84}{49}=\dfrac{12}{7}\)
NH
6 tháng 2 2023
`6/10=3/5`
`70/9=70/9`
`96/72=4/3`
`45/35=9/7`
`24/36=2/3`
`25/100=1/4`
AI
4
24 tháng 1 2019
\(\frac{18}{63}=\frac{18:9}{63:9}=\frac{2}{7}\)
\(\frac{54}{12}=\frac{54:6}{12:6}=\frac{9}{2}\)
\(\frac{27}{45}=\frac{27:9}{45:9}=\frac{3}{5}\)
\(\frac{135}{315}=\frac{135:45}{315:45}=\frac{3}{7}\)
1 tháng 3 2018
\(\frac{12}{84}+\frac{36}{63}\)
\(=\frac{1}{7}+\frac{4}{7}=\frac{5}{7}\)
học tốt ~~~
1 tháng 3 2018
\(\frac{12}{84}=\frac{1}{4}\)
\(\frac{36}{63}=\frac{4}{7}\)
Ta có :
\(\frac{1}{4}=1-\frac{3}{4}\)
\(\frac{4}{7}=1-\frac{3}{7}\)
Mà \(\frac{3}{4}>\frac{3}{7}\) nên \(\frac{1}{4}< \frac{4}{7}\)
\(\Rightarrow\) \(\frac{12}{84}< \frac{36}{63}\) .
NV
Nguyễn Việt Lâm
Giáo viên
14 tháng 1
a. Các phân số tối giản: \(\dfrac{17}{13}\) (duy nhất)
b.
Các phân số bằng \(\dfrac{4}{7}\) là: \(\dfrac{12}{21};\dfrac{36}{63};\dfrac{48}{84}\)
\(\dfrac{63}{77}\) = \(\dfrac{63:7}{77:7}\) = \(\dfrac{9}{11}\)
\(\dfrac{96}{72}\) = \(\dfrac{96:24}{72:24}=\dfrac{4}{3}\)
\(\dfrac{54}{36}\) = \(\dfrac{54:18}{36:18}\) = \(\dfrac{3}{2}\)
\(\dfrac{84}{63}\) = \(\dfrac{84:21}{63:21}\) = \(\dfrac{4}{3}\)
63/77 = 9/11
96/72 = 4/3
54/36 = 3/2
84/63 = 4/3