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1/ \(\frac{5}{-9}=\frac{15}{-27}\)
2/ \(\frac{-27}{-9}=\frac{15}{5}\)
3/ \(\frac{5}{15}=\frac{-9}{-27}\)
4/ \(\frac{-9}{5}=\frac{-27}{15}\)
tíc mình nha
a) 158 x 94
= 158 x ( 32 )4
= 158 x 38
= ( 15 x 3 )8 = 458
b) 49 : 527
= 49 : ( 53 ) 9
= 49 : 1259
= \(\left(\frac{4}{125}\right)^9\)
c) 2010 : 220
= 2010 : ( 22 )10
= 2010 : 410 = ( 20 : 4 ) 10 = 510
d) 275 : ( -7 ) 15
= 275 : [ ( - 7 )3 ]5
= 275 : ( - 21 )5
= \(\left(\frac{27}{-21}\right)^5=\left(\frac{9}{-7}\right)^5\)
Cbht
\(\dfrac{45^{10}\cdot5^{20}}{75^{15}}=\dfrac{\left(3^2\cdot5\right)^{10}\cdot5^{20}}{\left(3\cdot5^2\right)^{15}}=\dfrac{3^{20}\cdot5^{10}\cdot5^{20}}{3^{15}\cdot5^{30}}=3^5=243\\ \dfrac{6^6+6^3+3^3+3^6}{-73}=\dfrac{46656+216+27+729}{-73}=-\dfrac{47628}{73}\\ \dfrac{27^7+3^{15}}{9^9-27}=\dfrac{\left(3^3\right)^7+3^{15}}{\left(3^2\right)^9-3^3}=\dfrac{3^{21}+3^{15}}{3^{18}-3^3}=\dfrac{3^{15}\left(3^6+1\right)}{3^3\left(3^{15}-1\right)}=\dfrac{3^5\cdot730}{3^{15}-1}\\ \dfrac{8^{20}+4^{20}}{4^{25}+64^5}=\dfrac{\left(2^3\right)^{20}+\left(2^2\right)^{20}}{\left(2^2\right)^{25}+\left(2^6\right)^5}=\dfrac{2^{60}+2^{40}}{2^{50}+2^{30}}=\dfrac{2^{40}\left(2^{20}+1\right)}{2^{30}\left(2^{20}+1\right)}=2^{10}=1024\)
Ta có: \(\dfrac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^{10}\cdot6^{19}-7\cdot2^{29}\cdot27^6}\)
\(=\dfrac{5\cdot2^{30}\cdot3^{18}-2^2\cdot2^{27}\cdot3^{20}}{5\cdot2^{10}\cdot2^{19}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{3^{18}\cdot2^{29}\left(5\cdot2-3^2\right)}{5\cdot2^{29}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{3^{18}\cdot2^{29}}{2^{29}\cdot3^{18}\left(5\cdot2-7\right)}\)
\(=\dfrac{1}{3}\)
a) 158.94 = 158.(32)4 = 158.38 = (15.3)8 = 458
b) 49 : 527 = 49 : (53)9 = 49 : 1259 = \(\left(\frac{4}{125}\right)^9\)
c) 2010 : 220 = 2010 : (22)10 = 2010 : 410 = (20 : 4)10 = 510
d) 275 : (-7)15 = (33)5 : (-7)15 = 315 : (-7)15 = \(\left(\frac{3}{-7}\right)^{15}\)
a) \(5.\left(-27\right)=\left(-9\right).15\Rightarrow\frac{5}{-9}=\frac{15}{-27},\frac{5}{15}=-\frac{9}{-27},\frac{-27}{-9}=\frac{15}{5},-\frac{27}{15}=-\frac{9}{5}\)Tương tự các câu sau cũng như vậy !
buithianhtho hazz chị ạ, dạo này lười lắm, nên chỉ trả lời mấy câu ngắn ngắn hoặc tương tự thế thôi >>
