Rút gọn phân số. a.4157-19/12471-57. b.3.5.7.11.13.37.10101/1212120+40404
Rút gọn phân số:
\(a,\dfrac{31995-81}{42660-108}\)
\(b,\dfrac{3.5.7.11.13.37-10101}{1212120+40404}\)
\(\)
a: \(\dfrac{31995-81}{42660-108}=\dfrac{31914}{42552}=\dfrac{3}{4}\)
b: \(\dfrac{3\cdot5\cdot7\cdot11\cdot13\cdot37-10101}{1212120+40404}=\dfrac{545454}{1252524}=\dfrac{27}{62}\)
Bài 3: Rút gọn các phân số sau đây: a) 246246246 / 357357357
b) 555555 – 10101 /1212120 + 40404
d) 3.4.7 + 7.8.35 + 10.11.49 + 13.15.56 / 3.4.5 + 7.8.25 + 10.11.35+ 13.15.40
e) 1 +2 + 3 +...+ 8 + 9/ 11 + 12 + 13 + ...+ 18 + 19
c) 2 trên 40. 3 trên 18. 13 trên 2 / 2 trên 39. 3 trên 17. 39
Rút gọn phân số:A= 3.5.7.11.13.37-10101/1212120+40404
Rút gọn phân số
\(\frac{3.5.7.11.13.37-10101}{1212120+40404}\)
rút gọn biểu thức A=3.5.7.11.13.37-10101/1212120+40404
A= [5.11.10101 -10101]/[10101.120+10101.4] = 10101.[5.11-1] / 101.[120+4] = 54/124=27/62
đúng nhé
Rút gọn :
A = \(\frac{4157-19}{12471-57}\)
B = \(\frac{7}{10^2+8.10^2}\)
C = \(\frac{31995}{42660-108}\)
D = \(\frac{2^{45}.5^3.2^6.3}{8.2^{18}.81.5}\)
Ai làm đầy đủ , chi tiết , tui tk 10 lần .
Nhanh lên nhé ! 1h tui đi học rùi !
\(A=\frac{4157-19}{12471-57}\)\(=\frac{4138}{12414}\)\(=\frac{4138:4138}{12414:4138}\)\(=\frac{1}{3}\)
\(B=\frac{7}{10^2+8.10^2}\)\(=\frac{7}{100+8.100}\)\(=\frac{7}{100+800}\)\(=\frac{7}{900}\)
\(C=\frac{31995}{42660-108}\)\(=\frac{31995}{42552}\)\(=\frac{31995:27}{42552:27}\)\(=\frac{1185}{1576}\)
\(D=\frac{2^{45}.5^3.2^6.3}{8.2^{18}.81.5}=\frac{2^{51}.5^3.3}{2^3.2^{18}.3^4.5}=\frac{2^{51}.5^3.3}{2^{21}.3^4.5}=\frac{2^{30}.5^2}{3^3}\)
k mình nhé.
A=4138/12414=1/3
B=7/900
C=31995/42552=1185/1576
Phần D tui chịu, ahihi
Bài 1: Rút gọn biểu thức sau: A=3.5.7.11.13.37-10101/1212120+40404
Ta có:
\(A=\frac{3.5.7.11.13.37-10101}{1212120+40404}\)
\(=\frac{\left(3.7.11.13.37\right).5-10101.1}{120.10101+4.10101}\)
\(=\frac{10101.\left(5-1\right)}{10101.\left(120+4\right)}\)
\(=\frac{4}{124}=\frac{1}{31}\)
Sai rồi:
A = 5.11.(3.7.13.37) - 10101/(10101.120 + 10101.4)
= (5.11.10101 - 10101)/(10101.120+10101.4)
= 10101(5.11-1)/10101(120+4)
= 27/62.
A= 5.11.(3.7.13.37)-10101/(10101.120+10101.4)
=(5.11.10101-10101)/(10101.120+10101.4)
=10101.(5.11-1)/10101(120+4)
=27/62
k mik nha mik k lại 100 cái lun
Rút gọn
a/ \(\frac{4157-19}{12471-57}\) b/\(\frac{7}{10^2+6.10^2}\) c/\(\frac{31995-81}{42660-108}\) d/\(\frac{3.5.7.11.13.37-10101}{12.12.102+40404}\)
e/ \(\frac{2^{15}.5^3.2^6.3^4}{8.2^{18}.81.5}\) f/\(\frac{3^9.3^{20}.2^8}{3^{24}.243.2^6}\)
rút gọn biểu thức sau:3.5.7.11.13.37-10101/1212120+40404
.5.7.11.13.37-10101/1212120+40404
=3.5.7.11.13.37-10101/1212120.1/10+40404 (vì 1/1212120=1/121212.1/10)
= 3.37.7.11.13.5-101010/121212.1/100+40404
=111.1001.5-5/6.1/100+40404
=151515.5-250/3
=595959-250/3
=1787876/3
A=3.5.7.11.13.37-10101/1212120+40404
A=(5.11).(3.7.13.37)-10101/10101.120+4.10101
A=55.10101-10101/10101.(120+4)
A=10101.(55-1)/10101.124
A=54/124
A=27/62