Rút gọn
990/2610
374/506
3600-75/8400-175
9^14.25^5.8^7/ 18^12.625^3.24^3
rut gon: a)999/2610 b)374/506
c)3600-75/8400-175 d)9^14.25^5.8^7/18^12.625^3.24^3
a,999/2610=111/290
b,374/506=17/23
c,3600-75/8400-175=3/7
d,9^14.25^5.8^7/18^12.625^3.24^3=3/25
a, Ta có:999/2610=111/290
b, Ta có:374/506=17/2
c,Ta có:3600-75/8400-175=48.75-75/48.175-175=75.(48-1)/175.(48-1)=75/175=3/7
d, Ta có:(3^2)^14.(5^2)^5.(2^3)^7/(2.3^2)^12.(5^4)^3.(2^3.3)^3
=3^28.5^10.2^21/2^12.3^24.5^12.2^9.3^3
=3^28.5^10.2^21/2^21.3^27.5^12
=3/5^2=3/25
Rút gọn phân số
9^14.25^5.8^7 trên 18^12.625^3.24^3
\(\frac{9^{14}.25^5.8^7}{18^{12}.625^3.24^3}\)
\(=\frac{\left(3^2\right)^{14}.\left(5^2\right)^5.\left(2^3\right)^7}{\left(2.3^2\right)^{12}.\left(5^4\right)^3.\left(2^3.3\right)^3}\)
\(=\frac{3^{28}.5^{10}.2^{21}}{2^{12}.3^{24}.5^{12}.2^9.3}\)
\(=\frac{3^{28}.5^{10}.2^{21}}{2^{21}.3^{25}.5^{12}}\)
\(=\frac{3^3.1.1}{1.1.5^2}\)
\(=\frac{27}{25}\)
Rút gọn các phân số sau: 9^14.25^5.8^7/18^12.625^3.24^3
Ta có: \(\dfrac{9^{14}.25^5.8^7}{18^{12}.625^3.24^3}\)= \(\dfrac{9^{14}.25^5.8^7}{9^{12}.2^{12}.\left(25^2\right)^3.8^3.3^3}\)=\(\dfrac{9^{12}.9^2.25^5.8^7}{9^{12}.2^{12}.25^6.8^3.3^3}\)
= \(\dfrac{9^{12}.3^4.25^5.8^7}{9^{12}.\left(2^{12}.8^3\right).25^5.25.3^3}\)=\(\dfrac{9^{12}.3^3.3.25^5.8^7}{9^{12}.8^7.25^5.25.3^3}\)=\(\dfrac{\left(9^{12}.3^3.25^5.8^7\right).3}{\left(9^{12}.3^3.25^5.8^7\right).25}\)
=\(\dfrac{3}{25}\)
( Có một vài bước mik làm tắt bặn nhé!)
Câu 1: Thực hiện phép tính bằng cách hợp lí nhất
a) 2012 - (304 +2012 ) + (2013 + 304)
b) 9^14.25^5.8^7/18^12.625^3.24^3
a) 2012 - ( 304 + 2012 ) + ( 2013 + 304 )
= 2012 - 304 - 2012 + 2013 + 304
= 2012 + ( - 304 ) + ( - 2012 ) + 2013 + 304
= [ 2012 + ( - 2012 ) ] + [ ( - 304 ) + 304 ] + 2013
= 0 + 0 + 2013
= 2013
b) \(\frac{9^{14}.25^5.8^7}{18^{12}.625^3.24^3}\)
\(=\frac{\left(3^2\right)^{14}.\left(5^2\right)^5.\left(2^3\right)^7}{\left(3^2.2\right)^{12}.\left(5^4\right)^3.\left(2^3.3\right)^3}\)
\(=\frac{3^{28}.5^{10}.2^{21}}{3^{24}.2^{12}.5^{12}.2^9.3^3}\)
\(=\frac{3^{28}.5^{10}.2^{21}}{3^{27}.5^{12}.2^{21}}\)
\(=\frac{3}{5^2}=\frac{3}{25}\)
a) 2012 - ( 304 + 2012 ) + (2013 + 304 )
= 2012 - 304 +2012 + 2013 + 304
= ( 2012 - 2012 ) + ( 304 + 304 ) + 2013
= 0 + 608 + 2013
= 2621
Chờ một chút để minh suy nghĩ
rút gọn phân số 9^14.225^5.8^7/ 18^12.625^3.24^3
giúp mik nhé :-)))
A=9^14.25^5.8^7/18^12.(25^2)^3.24^3
1, Rút gọn
\(\frac{374}{506}\); \(\frac{3600-75}{8400-175}\); \(\frac{9^{14}.25^5.8^7}{18^{12}.625^3.24^3}\); \(\frac{2^{10}.3^{10}-2^{10}.3^9}{2^9.3^{10}}\)
2, Rút gọn 1 cách nhanh nhất
\(\frac{1989.1990+3978}{1992.1991-3984}\)
Rút gọn :
a) \(\frac{3600-75}{8400-105}\)
b) \(\frac{9^{14}.25^5.8^2}{18^{12}.625^3.24^3}\)
c) C = \(\frac{1+3+5+...+19}{21+23+25+...+39}\)
a)\(\frac{\text{3600−75}}{\text{8400−105}}=\frac{3.1200-3.25}{7.1200-7.25}=\frac{3.\left(1200-25\right)}{7.\left(1200-25\right)}=\frac{3}{7}\)
b) \(\frac{9^{14}.25^5.8^2}{18^{12}.625^3.24^3}=\frac{\left(3^2\right)^{14}.\left(5^2\right)^5.\left(2^3\right)^7}{\left(2.3^2\right)^{12}.\left(5^4\right)^3.\left(2^3.3\right)^3}=\frac{3^{28}.5^{10}.2^{21}}{2^{12}.3^{24}.5^{12}.2^9.3^3}=\frac{3^{28}.5^{10}.2^{21}}{2^{21}.3^{27}.5^{12}}=\frac{3}{5^2}=\frac{3}{25}\)
c) \(C=\frac{1+3+5+...+19}{21+23+25+...+39}=\frac{\left(1+19\right).19:2}{\left(21+39\right).19:2}=\frac{190}{570}=\frac{1}{3}\)
c)
C = 1+3+5+...+1921+23+25+...+39
Số số hạng của tử là : ( 19 -1 ):2 + 1= 10 số
Số số hạng của mẫu là : ( 39 - 21 ) : 2 +1 = 10 số
Tổng các số hạng của tử là : ( 1 + 19 ) x 10 : 2 = 100
Tổng các số hạng của mẫu là : ( 21 + 39 ) x 10 : 2 = 300
Vậy C = 100/300 = 1 / 3
Mik làm mỗi ý C) thui . Sorry nha ! Nhớ tik
-9^14.25^5.(-8)^7/-18^12.(-625)^3.24^3