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A=2 . 4 . 8 . 16 . 156
=2. 2^2 . 2^3 . 2^4 . 2^7
=2^17
B=5 . 25 .125 . 625 . 5^7
=5 . 5^2 . 5^3 . 5^4 . 5^7
=5^17
tích cho mk nha
a)\(4^3.2^4\div\left(4^2.\frac{1}{32}\right)\)
\(=\left(2^2\right)^3.2^4\div\left(2^2\right)^2\div32\).
\(=2^{\left(2.3\right)}.2^4\div2^{\left(2.2\right)}\div2^5\)
\(=2^6.2^4\div2^4\div2^5\)
\(=2^{6+4-4-5}=2^1\)
b)\(\left(\frac{1}{5}\right)^5=\frac{1}{5^5}=\left|5^5\right|=5^{-5}\)
\(\frac{1}{125}=\frac{1}{5^3}=\left|5^3\right|=5^{-3}\)
c)\(\frac{4}{25}=\frac{2^2}{5^2}=\left(\frac{2}{5}\right)^2=0,4^2\)
\(\frac{-8}{125}=\frac{-2^3}{5^3}=\left(\frac{-2}{5}\right)^2=-0,4^3=0,4^{-3}\)
\(\frac{16}{625}=\frac{2^4}{5^4}=\left(\frac{2}{5}\right)^4=0,4^4\)
Giải
a) (−8).(−3)3.(+125)(−8).(−3)3.(+125)
= [(−2).(−2).(−2)].[(−3).(−3).(−3)].(5.5.5)[(−2).(−2).(−2)].[(−3).(−3).(−3)].(5.5.5)
= [(−2).(−3).5].[(−2).(−3).5].[(−2).(−3).5][(−2).(−3).5].[(−2).(−3).5].[(−2).(−3).5]
= 30.30.30=30330.30.30=303
b) 27.(−2)3.(−7).(+49)27.(−2)3.(−7).(+49)
= (3.3.3).[(−2).(−2).(−2)].[(−7).(−7).(−7)](3.3.3).[(−2).(−2).(−2)].[(−7).(−7).(−7)]
= [3.(−2).(−7)].[3.(−2).(−7)].[3.(−2).(−7)][3.(−2).(−7)].[3.(−2).(−7)].[3.(−2).(−7)]
= 42.42.42=423
− 8 . − 3 3 . + 125 = − 2 3 . − 3 3 .5 3 = − 2. − 3 .5 3 = 30 3
\(125=5^3\)
\(25^2=\left(5^2\right)^2=5^{2.2}=5^4\)
\(\left(5^3\right)^2=5^{3.2}=5^6\)
\(125^5=\left(5^3\right)^5=5^{3.5}=5^{15}\)
\(625^4=\left(5^4\right)^4=5^{4.4}=5^{16}\)
\(125.5^2=5^3.5^2=5^{3+2}=5^5\)
125 = 53
252 = (52)2 = 54
(53)2 = 56
1255 = ( 53)5 = 515
6254 = (54)4 = 516
125 . 52 = 53 . 52 = 55