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23 tháng 8 2019
BÀI 1
\(\frac{2^7.9^3}{6^5.8^2}=\frac{2^7.\left(3^2\right)^3}{\left(2.3\right)^5.\left(2^3\right)^2}=\frac{2^7.3^6}{2^5.3^5.2^6}=\frac{3}{2^4}=\frac{3}{16}.\)
bài 2
a) \(\frac{1}{2}-\frac{1}{3}+\frac{1}{12}=\frac{6}{12}-\frac{4}{12}+\frac{1}{12}=\frac{3}{12}=\frac{1}{4}\)
b) \(\frac{9^9.27^4}{3^8.81^5}=\frac{\left(3^2\right)^9.\left(3^3\right)^4}{3^8.\left(3^4\right)^5}=\frac{3^{18}.3^{12}}{3^8.3^{20}}=\frac{3^{30}}{3^{28}}=3^2=9\)
Study well
TH
23 tháng 8 2019
Bài 1: \(\frac{2^7.9^3}{6^5.8^2}=\frac{2^7.3^6}{2^5.3^5.2^6}=\frac{3}{2^4}=\frac{3}{16}\)
Bài 2:
a)\(\frac{1}{2}-\frac{1}{3}+\frac{1}{12}=\frac{6}{12}-\frac{4}{12}+\frac{1}{12}=\frac{6-4+1}{12}=\frac{1}{4}\)
b)\(\frac{9^9.27^4}{3^8.81^5}=\frac{9^9.3^{12}}{3^8.9^{10}}=\frac{3^4}{9}=\frac{3^4}{3^2}=3^2=9\)
PA
5 tháng 7 2016
a.
\(\frac{2^7\times9^3}{6^5\times8^2}=\frac{2^7\times\left(3^2\right)^3}{\left(2\times3\right)^5\times\left(2^3\right)^2}=\frac{2^7\times3^6}{2^5\times3^5\times2^6}=\frac{3}{2^4}=\frac{3}{16}\)
b.
\(\frac{6^3+3\times6^2+3^3}{-13}=\frac{\left(2\times3\right)^3+3\times\left(3\times2\right)^2+3^3}{-13}=\frac{2^3\times3^3+3\times3^2\times2^2+3^3}{-13}=\frac{8\times3^3+3^3\times4+3^3}{-13}\)\(=\frac{3^3\times\left(8+4+1\right)}{-13}=\frac{27\times13}{-13}=-27\)
c.
\(\frac{5^4\times20^4}{25^5\times4^5}=\frac{\left(5\times20\right)^4}{\left(25\times4\right)^5}=\frac{100^4}{100^5}=\frac{1}{100}\)
d.
\(\left(\frac{5^4-5^3}{125^4}\right)=\frac{5^3\times\left(5-1\right)}{\left(5^3\right)^4}=\frac{5^3\times4}{5^{12}}=\frac{4}{5^9}\)
NN
5 tháng 7 2016
a)\(\frac{2^7.9^3}{6^5.8^2}=\frac{2^7.\left(3^2\right)^3}{2^5.3^5.\left(2^3\right)^2}=\frac{2^7.3^6}{2^5.3^5.2^6}=\frac{3}{2^4}\)
b)\(\frac{6^3+3.6^2+3^3}{-13}=\frac{6.6^2+3.6^2+3^3}{-13}=\frac{6^2.\left(6+3\right)+3^3}{-13}=\frac{6^2.9+3^3}{-13}=\frac{6^2.3^2+3.3^2}{-13}=\frac{3^2.\left(6^2+3\right)}{-13}=\frac{3^2.39}{-13}=3^2.\left(-3\right)=-27\)
c)\(\frac{5^4.20^4}{25^5.4^5}=\frac{100^4}{100^5}=\frac{1}{100}\)
23 tháng 2 2019
\(a,=\frac{2^7\cdot\left(3^2\right)^3}{2^5\cdot3^5\cdot2^3}=\frac{2^7\cdot3^6}{2^8\cdot3^5}=\frac{3}{2}\)
23 tháng 2 2019
câu a)
\(=\frac{2^7\times\left(3^2\right)^3}{2^5\times3^5\times2^3}=\frac{2^7\times3^6}{2^8\times3^5}=\frac{3}{2}\)
DL
6 tháng 7 2017
a)\(\frac{36^7}{2^{15}\cdot27^5}=\frac{36^7}{\left(2^3\right)^5\cdot27^5}\)
\(=\frac{36^7}{\left(8\cdot27\right)^5}=\frac{36^7}{216^5}\)
\(=\frac{36^7}{36^5\cdot6^5}=\frac{36^5\cdot36^2}{36^5\cdot6^5}\)
\(=\frac{36^2}{6^5}=\frac{\left(6^2\right)^2}{6^5}=\frac{6^4}{6^5}=\frac{1}{6}\)
\(\)
HN
2
13 tháng 8 2015
\(=\frac{3^3.5^3.2^{12}.2^5.5^5}{2^{12}.2^8.5^4.3^6.2^{18}}=\frac{3^3.5^8.2^{17}}{3^6.5^4.2^{38}}=\frac{1.5^4}{3^3.1.2^{21}}=\frac{5^4}{3^3.2^{21}}\)
2 tháng 12 2020
\(\frac{15^3.4^6.10^5}{8^4.20^4.24^6}=\frac{\left(3.5\right)^3.\left(2^2\right)^6.\left(2.5\right)^5}{\left(2^3\right)^4.\left(2^2.5\right)^4.\left(2^3.3\right)^6}=\frac{3^3.5^3.2^{12}.2^5.5^5}{2^{12}.2^8.5^4.2^{18}.3^6}=\frac{2^{17}.3^3.5^8}{2^{38}.3^6.5^4}=\frac{5^4}{2^{21}.3^3}\)
Chúc bạn học tốt
HN
1
13 tháng 8 2015
\(\frac{15^3.4^6.10^5}{8^4.20^4.24^6}=\frac{3^3.5^3.2^6.2^6.2^5.5^5}{2^4.2^4.2^4.2^4.2^4.5^4.2^6.2^6.2^6.3^6}=\frac{3^3.5^8.2^{17}}{2^{38}.5^4.3^6}=\frac{5^4}{2^{21}.3^3}\)
nhớ cho mình đúng hen
13 tháng 8 2015
a))\(\frac{2^3.3^3.3^3.3^4.5^4.5^4.3^7.2^7.2^7.2^7.2^6}{2^5.2^5.3^5.2^6.2^6.3^6.3^6.3^4.5^4}=\frac{5^4.2^7}{3^4}=\frac{625.128}{81}=\frac{80000}{81}\)
13 tháng 8 2015
\(\frac{18^3.75^4.24^7.2^6}{12^5.36^6.15^4}=\frac{2^3.3^6.3^4.5^8.2^{21}.3^7.2^6}{2^{10}.3^5.2^{12}.3^{12}.3^4.5^4}=\frac{2^{30}.3^{17}.5^8}{2^{22}.3^{21}.5^4}=\frac{2^8.5^4}{3^4}\)
mình làm đúng đó không tin thì bấm máy tính thử đi phạm thủy linh làm sai rồi
cho mình đúng hen
HT
1
6 tháng 7 2017
\(\frac{2^7.3^6}{6^5.8^2}=\frac{2^7.3^6}{\left(2.3\right)^5.\left(2^3\right)^2}=\frac{2^7.3^6}{2^5.3^5.2^6}=\frac{2^7.3^6}{2^{11}.3^5}=\frac{3}{2^4}=\frac{3}{16}\)
LV
1
\(A=\frac{4.8.9^3+15.36^3}{6^5.8^2-4.24^3}=\frac{2^2.2^3.\left(3^2\right)^3+\left(3.5\right).\left(2^2.3^2\right)^3}{\left(2.3\right)^5.\left(2^3\right)^2-2^2.\left(2^3.3\right)^3}=\frac{2^2.2^3.3^6+3.5.2^6.3^6}{2^5.3^5.2^6-2^2.2^9.3^3}=\frac{2^5.3^6+2^6.3^7.5}{2^{11}.3^5-2^{11}.3^3}\)\(=\frac{2^5.3^6.\left(1+2.3.5\right)}{2^{11}.3^3.\left(3^2-1\right)}=\frac{2^5.3^6.31}{2^{11}.3^3.8}=\frac{2^5.3^6.31}{2^{11}.3^3.2^3}=\frac{2^5.3^6.31}{2^{14}.3^3}=\frac{3^3.31}{2^9}\)
Chúc bạn học tốt
thank