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Ta có :
\(\frac{114}{122}\)\(=\)\(\frac{57}{61}\)
\(\frac{5757}{6161}\)\(=\)\(\frac{57}{61}\)
\(\Rightarrow\)Hai phân số ( \(\frac{114}{122}\)= \(\frac{5757}{6161}\)) = \(\frac{57}{61}\)( Vì khi rút gọn thì hai phân số này bằng nhau ) => đpcm
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)
\(\frac{-15}{21}=\frac{-15\div3}{21\div3}=\frac{-5}{7}\)
\(\frac{-55}{77}=\frac{-55\div11}{77\div11}=\frac{-5}{7}\)
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 \(\frac{-37}{51}=\frac{-37}{51}\Rightarrow\frac{-3737}{5151}=\frac{-373737}{515151}\)
\(a,\frac{22}{55}=\frac{2}{5}\)
\(b,\frac{20}{-140}=\frac{-1}{7}\)
k mk nha thanks nhiều
Mọi người ủng hộ mk nhé
a: x/5=32/80
nên x/5=2/5
hay x=2
13/x=26/30
nên 13/x=13/15
hay x=15
-x/7=22/-77
=>x/7=2/7
hay x=2
b: x/9=28/36
=>x/9=7/9
hay x=7
-10/x=50/55
=>-10/x=10/11
hay x=-11
a)
1) x/5 = 32/80
\(x : 5 = 32 : 80\) \(x = 5 \cdot \frac{32}{80}\) \(x = 5 \cdot \frac{2}{5}\) \(x = 2\)
2) 13/x = 26/30
\(13 : x = 26 : 30\) \(13 \cdot 30 = x \cdot 26\) \(390 = 26 x\) \(x = 390 : 26\) \(x = 15\)
3) -x/7 = 22/(-77)
\(- x : 7 = 22 : \left(\right. - 77 \left.\right)\) \(- x = 7 \cdot \frac{22}{- 77}\) \(- x = 7 \cdot \left(\right. - \frac{2}{7} \left.\right)\) \(- x = - 2\) \(x = 2\)
b)
1) x/9 = 28/36
\(x : 9 = 28 : 36\) \(x = 9 \cdot \frac{28}{36}\) \(x = 9 \cdot \frac{7}{9}\) \(x = 7\)
2) -10/x = 50/55
\(- 10 : x = 50 : 55\) \(- 10 \cdot 55 = 50 x\) \(- 550 = 50 x\) \(x = - 550 : 50\) \(x = - 11\)
3) 23/(-x) = 46/50
\(23 : \left(\right. - x \left.\right) = 46 : 50\) \(23 \cdot 50 = 46 \left(\right. - x \left.\right)\) \(1150 = - 46 x\) \(x = 1150 : \left(\right. - 46 \left.\right)\) \(x = - 25\)
✅ Kết quả cuối cùng
a)
- x = 2
- x = 15
- x = 2
b)
- x = 7
- x = -11
- x = -25
a)Ta có \(\hept{\begin{cases}\frac{-22}{55}=\frac{-22:11}{55:11}=\frac{-2}{3}\\\frac{-26}{65}=\frac{-26:13}{65:13}=\frac{-2}{3}\end{cases}}\)=> \(\frac{-22}{55}=\frac{-26}{65}\)
b) Ta có : \(\hept{\begin{cases}\frac{114}{122}=\frac{114:2}{112:2}=\frac{57}{61}\\\frac{5757}{6161}=\frac{5757:101}{6161:101}=\frac{57}{61}\end{cases}\Rightarrow\frac{114}{122}=\frac{5757}{6161}}\)