RUT GON PHAN SO DEN KHI TOI GIAN
49+7.49
49
rut gon phan so 42/182 den phan so toi gian ta duoc phan so a/b khi do a+b=
\(\frac{42}{182}=\frac{3}{13}\)
Do đó a+b=3+13=15
ủng hộ cho mình tròn 550 nha
rut gon phan so 195/221 thanh phan so toi gian
rut gon phan so 272727/727272 de duoc phan so toi gian
\(\frac{272727}{727272}=\frac{27.10101}{72.10101}=\frac{27}{72}=\frac{3.9}{8.9}=\frac{3}{8}\)
Rut gon phan so 306/342 duoc phan so toi gian la
131313/151515 rut gon ve phan so toi gian
= \(\frac{13}{15}\).
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Ai tk cho mình mình tk l
152152152 / 172172172 RUT GON THANH PHAN SO TOI GIAN
\(\frac{152152152}{172172172}=\frac{38\cdot4004004}{43\cdot4004004}=\frac{38}{43}\)
\(\frac{152152152}{172172172}\) = \(\frac{152152152:1001001}{172172172:1001001}\)= \(\frac{152}{172}\) = \(\frac{38}{43}\)
Rut gon phan so 195/221,duoc toi gian la
\(\frac{195}{221}=\frac{195:13}{221:13}=\frac{15}{17}\)
tim stn n de phan so A = 8n + 193 phan 4n+3 sao cho
a) co gia tri stn
b) la phan so toi gian
c) voi gia tri nao cua n trong khoang 150 den 170 thi phan so A rut gon duoc
a)\(A=\frac{8n+193}{4n+3}=\frac{2.\left(4n+3\right)+187}{4n+3}=2+\frac{187}{4n+3}\)\(\Rightarrow187⋮4n+3\Rightarrow4n+3\inƯ\left(187\right)=\left\{11;17;187\right\}\)
+) 4n + 3 = 11 => n = 2
+) 4n +3 = 187 => n = 46
+) 4n + 3 = 17 => 4n = 14 ( loại )
Vậy n = 2 và 46
b) Gọi ƯCLN ( 8n + 193; 4n + 3) = d
=> ( 8n + 193; 4n + 3 ) : d => (8n + 193) - 2.(4n+3)
=> ( 8n+193 ) - ( 8n + 6 ) : d
=> 187 : d mà A là phân số tối giản => A \(\ne\) 187
=> n \(\ne\) 11k + 2 (k \(∈\) N)
=> n \(\ne\) 17m + 12 (m \(∈\) N )
c) Với n = 156 => A = 77/19
n = 165 => A = 89/39
n = 167 => A = 139/61
Rut gon phan so 24/36 ta duoc phan so toi gian la:
A.12/18
B.8/12
C.2/3