3^5.9^2 / 3^3
5 + 5.9+5.9^2+5.9^3+.....+5.9^99
Cho E=2^15.0,5^5+3.2^10/2^11.2^3-2^15:2^3 Cho F=2.6^7+6^8/2^5.9^4-2.3^7+3^8 Cho G=4^5.9^4-2.6^9/2^10.3^8+6^8.20
C=2/4.7-3/5.9+2/7.10-3/9.13+...+3/301.304-3/401.405
sory em học lớp 5 không biết làm nếu biết em đã làm rồi hihihih.....
2^5.9^3/ 3^4.2^7
\(\frac{2^5.9^3}{3^4.2^7}=\frac{\left(3^2\right)^3}{3^4.2^2}=\frac{3^6}{3^4.2^2}=\frac{3^2}{2^2}=\frac{9}{4}\)
quá dễ!!!!!!
RÚT GỌN
\(A=_{100}+5+5.9+5.9^2+5.9^3+...+5.9^{99}\)
AI LÀM ĐƯỢC MÌNH CHO TIK
PHẢI GIẢI RA ĐẦY ĐỦ NHA!!!
Tính:
a) \(\dfrac{4^5.9^4-2.6^9}{2^{10}.3^8+6^8.20}\)
b) T=\(\dfrac{5^{16}.27^7}{125^5.9^{11}}\)
a: \(=\dfrac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{10}\cdot3^8+2^{10}\cdot3^8\cdot5}=\dfrac{2^{10}\cdot3^8\left(1-3\right)}{2^{10}\cdot3^8\left(1+5\right)}=\dfrac{-2}{6}=\dfrac{-1}{3}\)
b: \(=\dfrac{5^{16}\cdot3^{21}}{5^{15}\cdot3^{22}}=\dfrac{5}{3}\)
A=\(\dfrac{2}{4.7}\)\(-\dfrac{3}{5.9}\)\(+\dfrac{2}{7.10}\)\(-\dfrac{3}{9.13}\)\(+.....\)\(+\dfrac{2}{301.304}\)\(-\dfrac{3}{401.405}\)
tính A
\(A=\dfrac{2}{4.7}-\dfrac{3}{5.9}+\dfrac{2}{7.10}-\dfrac{3}{9.13}+...+\dfrac{2}{301.304}-\dfrac{3}{401.405}\)
\(A=\dfrac{2}{4.7}+\dfrac{2}{7.10}+\dfrac{2}{301.304}...-\left(\dfrac{3}{5.9}+\dfrac{3}{9.13}+...+\dfrac{3}{401.405}\right)\)
\(A=2\left(\dfrac{1}{4.7}+\dfrac{1}{7.10}+\dfrac{1}{301.304}\right)...-3\left(\dfrac{1}{5.9}+\dfrac{1}{9.13}+...+\dfrac{1}{401.405}\right)\)
\(A=2\left(\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{10}+\dfrac{1}{301}-\dfrac{1}{304}\right)...-3\left(\dfrac{1}{5}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{13}+...+\dfrac{1}{401}-\dfrac{1}{405}\right)\)
\(A=2\left(\dfrac{1}{4}-\dfrac{1}{304}\right)-3\left(\dfrac{1}{5}-\dfrac{1}{405}\right)\)
\(A=2\left(\dfrac{76}{304}-\dfrac{1}{304}\right)-3\left(\dfrac{81}{5}-\dfrac{1}{405}\right)\)
\(A=2.\dfrac{75}{304}-3.\dfrac{80}{405}=\dfrac{75}{152}-\dfrac{80}{135}=\dfrac{10125-12160}{152.135}=-\dfrac{2035}{152.135}=-\dfrac{407}{4104}\)
(2^5.9-2^5.7):2^3-(2021^0)=
giúp mk đy
\(\left(2^5.9-2^5.7\right)\div2^3-2021^0\)
\(=2^5\left(9-7\right)\div2^3-1\)
\(=2^6\div2^3-1\)
\(=2^3-1\)
\(=7\)
So sánh
a) 5.9 với 0;
b) ( - 3) . (- 47) với 15;
c) (- 3).(- 2) với -3;
d) ( - 9) . ( -7) với - 9.
a) 5.9 > 0
b) (-3) . (-47) > 15
c) (-3) .(-2) > (-3)
d) (-9) .(-7) > (9)