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\(\frac{-15}{21}=\frac{-15\div3}{21\div3}=\frac{-5}{7}\)
\(\frac{-55}{77}=\frac{-55\div11}{77\div11}=\frac{-5}{7}\)
Vì \(\frac{-5}{7}=\frac{-5}{7}\Rightarrow\frac{-15}{21}=\frac{-55}{77}\)
b , \(\frac{-3737}{5151}=\frac{-3737\div101}{5151\div101}=\frac{-37}{51}\)
\(\frac{-373737}{515151}=\frac{-373737\div10101}{515151\div10101}=\frac{-37}{51}\)
Vì \(\frac{-37}{51}=\frac{-37}{51}\Rightarrow\frac{-3737}{5151}=\frac{-373737}{515151}\)
a: \(\dfrac{20}{30}=\dfrac{2}{3}\)
\(\dfrac{30}{45}=\dfrac{2}{3}\)
Do đó: \(\dfrac{20}{30}=\dfrac{30}{45}\)
b: \(\dfrac{-25}{35}=\dfrac{-5}{7}\)
\(\dfrac{-55}{77}=\dfrac{-5}{7}\)
Do đó: \(-\dfrac{25}{35}=-\dfrac{55}{77}\)
a,20/30=2/3
30/45=2/3
->20/30=30/45
b -25/35=-5/7
-55/77=-5/7
-> -25/35=-55/77
a: 20/30=2/3
30/45=2/3
=>20/30=30/45
b: -25/35=-5/7
-55/77=-5/7
=>-25/35=-55/77
a) -22/55 = -2/5 ; -26/65 = -2/5
=> -22/55 = -26/65 (= -2/5)
b) 114/122 = 57/61 ; 5757/6161 = 57/61
=> 114/122 = 5757/6161 (=57/61)
1) ???
2)
a, \(\frac{-22}{55}=\frac{-22:11}{55:11}=\frac{-2}{5}\)
\(\frac{-26}{65}=\frac{-26:13}{65:13}=\frac{-2}{5}\)
=> ĐPCM
b, \(\frac{114}{122}=\frac{114:2}{122:2}=\frac{57}{61}\)
\(\frac{5757}{6161}=\frac{5757:101}{6161:101}=\frac{57}{61}\)
=> ĐOCM
3)
\(\frac{30303}{80808}+\frac{303030}{484848}=\frac{15}{4}+\frac{5}{8}=\frac{30+5}{8}=\frac{35}{8}\)
~ Ủng hộ nha ae ~
1, \(\frac{5}{-7}=\frac{-5}{7}=\)\(\frac{-10}{14}\)
2, a, \(\frac{-22}{55}=\frac{-26}{65}\)vì \(-22.65=-26.55=-1430\)
b,\(\frac{114}{122}=\frac{5757}{6161}\)vì \(114.6161=122.5757=702354\)
3,\(\frac{30303}{80808}+\frac{303030}{484848}=\frac{3}{8}+\frac{5}{8}=1\)
\(\frac{26}{39}=\frac{2}{3}\)
\(\frac{55}{77}=\frac{5}{7}\)
\(\frac{39}{65}=\frac{3}{5}\)
\(\frac{51}{85}=\frac{3}{5}\)
\(\frac{38}{57}=\frac{2}{3}\)
Các phân số bằng nhau là:
\(\frac{39}{65}=\frac{51}{85}\left(=\frac{3}{5}\right)\)
\(\frac{26}{39}=\frac{38}{57}\left(=\frac{2}{3}\right)\)
