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23 tháng 7 2016

\(A=\frac{2^{12}.27^3}{6^7.16^2}=\frac{2^{12}.\left(3^3\right)^3}{2^7.3^7.\left(2^4\right)^2}=\frac{2^{12}.3^9}{2^7.3^7.2^8}=\frac{2^{12}.3^9}{2^{15}.3^7}=\frac{1.3^2}{2^3.1}=\frac{9}{8}\)

23 tháng 7 2016

\(A=\frac{2^{12}\cdot27^3}{6^7\cdot16^2}\)

\(A=\frac{4096\cdot19683}{279936\cdot256}\)

\(A=\frac{80621568}{71663616}\)

24 tháng 8 2020

a) Ta có : 2 + 4 + 6 + 8 +... + 16 + 18

SSH : (18 - 2) : 2 + 1 = 9(số)

Tổng : (2 + 18).9 : 2 = 90

\(A=\frac{27\cdot45+27\cdot45}{90}=\frac{27\left(45+45\right)}{90}=\frac{27\cdot90}{90}=27\)

b) Ta có : 135.1420 + 45.780.3 = 135.1420 + 135.780 = 135(1420 + 780) = 135.2200 (*)

3 + 6 + 9 + 12 + ... + 24 + 27

Số số hạng : (27 - 3) : 3 + 1 = 9(số)

Tổng : (3 + 27).9 : 2 = 135 (**)

Từ (*) và (**) suy ra 

=> \(B=\frac{135\cdot2200}{135}=2200\)

24 tháng 8 2020

a)           

2 + 4 + 6 + ... + 16 + 18                      

Số số hạng : 

( 18 - 2 ) / 2 + 1 = 9 

Tổng : 

( 18 + 2 ) x 9 / 2 = 90 

\(A=\frac{27\cdot45+27\cdot45}{90}\) 

\(=\frac{27\left(45+45\right)}{90}\) 

\(=\frac{27\cdot90}{90}\)    

\(=27\) 

b) 

3 + 6 + 9 + 12 + ... + 24 + 27 

Số số hạng : 

( 27 - 3 ) / 3 + 1 = 9 

Tổng : 

( 27 + 3 ) x 9 /2 = 135 

\(B=\frac{135\cdot1420+45\cdot780\cdot3}{135}\)  

\(=\frac{135\cdot1420+135\cdot780}{135}\)      

\(=\frac{135\left(1420+780\right)}{135}\)                

\(=\frac{135\cdot2200}{135}\)    

= 2200 

14 tháng 4 2018

\(\frac{2^{19}.27^3+15^4.4^9.9^4}{6^9.2^{10}+12^{10}}\)

\(=\frac{2^{19}.\left(3^3\right)^3+\left(3.5\right)^4.\left(2^2\right)^9.\left(3^2\right)^4}{\left(2.3\right)^9.2^{10}+\left(2^2.3\right)^{10}}\)

\(=\frac{2^{19}.3^9+3^{12}.5^4.2^{18}}{2^{19}.3^9+2^{20}.3^{10}}\)

\(=\frac{2^{18}.3^9.\left(2+3^3+5^4\right)}{2^{19}.3^9.\left(1+2+3\right)}\)

\(=\frac{654}{2.6}\)

\(=\frac{109}{2}\)

Chúc bn học tốt !!!!

16 tháng 9 2016

\(H=\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)

\(H=\frac{2^{19}.\left(3^3\right)^3+3.5.\left(2^2\right)^9.\left(3^2\right)^4}{\left(2.3\right)^9.2^{10}+\left(2^2.3\right)^{10}}\)

\(H=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^9.3^9.2^{10}+2^{20}.3^{10}}\)

\(H=\frac{2^{19}.3^9+2^{18}.5.3^9}{2^{19}.3^9+2^{20}.3^{10}}\)

\(H=\frac{2^{18}.3^9.\left(2+5\right)}{2^{19}.3^9.\left(1+2.3\right)}\)

\(H=\frac{2^{18}.3^9.7}{2^{19}.3^9.\left(1+6\right)}\)

\(H=\frac{2^{18}.3^9.7}{2^{19}.3^9.7}=\frac{1}{2}\)

\(K=\frac{4^7.2^8}{3.2^{15}.16^2-5.2^2.\left(2^{10}\right)^2}\)

\(K=\frac{\left(2^2\right)^7.2^8}{3.2^{15}.\left(2^4\right)^2-5.2^2.2^{20}}\)

\(K=\frac{2^{14}.2^8}{3.2^{15}.2^8-5.2^{22}}\)

\(K=\frac{2^{22}}{3.2^{23}-5.2^{22}}\)

\(K=\frac{2^{22}}{2^{22}.\left(3.2-5\right)}=\frac{2^{22}}{2^{22}.1}=1\)

15 tháng 7 2017

a) \(\frac{6^{10}.27^5}{4^5.81^6}=\frac{\left(2.3\right)^{10}.\left(3^3\right)^5}{\left(2^2\right)^5.\left(3^4\right)^6}=\frac{2^{10}.3^{10}.3^{15}}{2^{10}.3^{24}}=\frac{2^{10}.3^{25}}{2^{10}.3^{24}}=\frac{3^{25}}{3^{24}}=3\)
b) \(\frac{72^3.54^2}{108^4}=\frac{\left(2^3.3^2\right)^3.\left(2.3^3\right)^2}{\left(2^2.3^3\right)^4}=\frac{2^9.3^6.2^2.3^6}{2^8.3^{12}}=\frac{2^{11}.3^{12}}{2^8.3^{12}}=\frac{2^{11}}{2^8}=2^3=8\)
c) \(\frac{27^4.2^3-3^{10}.4^3}{6^4.9^3.4}=\frac{\left(3^3\right)^4.2^3-3^{10}.\left(2^2\right)^3}{\left(2.3\right)^4.\left(3^2\right)^3.2^2}=\frac{3^{12}.2^3-3^{10}.2^6}{2^4.3^4.3^6.2^2}\)
\(\frac{3^{12}.2^3-3^{10}.2^6}{2^6.3^{10}}=\frac{3^{12}.2^3}{2^6.3^{10}}-\frac{3^{10}.2^6}{2^6.3^{10}}=\frac{3^2}{2^3}-1=\frac{9}{8}-1=\frac{1}{8}\)
 

23 tháng 7 2019

6 tháng 8 2018

\(A=\frac{13,5.1420+4,5.780.3}{3+6+9+...+24+27}\)

\(=\frac{13,5.1420+\left(4,5.3\right).780}{\left(3+27\right)+\left(6+24\right)+\left(9+21\right)+\left(12+18\right)+\left(15+15\right)}\)

\(=\frac{13,5.\left(1420+780\right)}{30.5}\)

\(=\frac{13,5.2200}{150}\)

\(=\frac{29700}{150}=198\)

6 tháng 8 2018

Chị làm lại nhé

\(A=\frac{13,5.1420+4,5.780.3}{3+6+9+12+15+18+21+24+27}\)

\(=\frac{13,5.\left(1420+780\right)}{\left(3+27\right)+\left(6+24\right)+\left(9+21\right)+\left(12+18\right)+15}\)

\(=\frac{13,5.2200}{30.4+15}\)

\(=\frac{29700}{135}=220\)