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a.
A = 72^3.54^2/108^4
A = (72.54:108)^2:108^2.72
A = 36^2:108^2.72
A = (36:108)^2.72
A = (1/3)^2.72
A = 72/9
A = 8
B = \(\frac{3^{10}.11+3^{10}.5}{3^9.2^4}\)
B = \(\frac{3^{10}.\left(11+5\right)}{3^9.2^4}\)
B = \(\frac{3^{10}.16}{3^9.16}\)
B = 3
36 giây trước (17:40)
Tìm X :
1 ) 3x - 35 =40
3x = 75
x = 25
2) ( x + 12 ) .25 = 0
Vì ( x + 12 ) .25 = 0
mà \(25\ne0\)
nên x +12 =0
=> x= -12
7) 3x = 32
Vậy x = 2
9) 3(x + 4) = 128 - 23
3(x + 4) = 105
x+4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
Vậy x =31
Câu b:
B = (3\(^{10}\).11 + 3\(^{10}\).5) : (3\(^9\).2\(^4\))
B = 3\(^{10}\).(11 + 5): (3\(^9\).2\(^4\))
B = 3\(^{10}\).16:(3\(^9\).2\(^4\))
B = (3\(^{10}\) : 3\(^9\)).(16 : 2\(^4\))
B = 3.1
B = 3
Câu c:
C = (2\(^{10}\).13 + 2\(^{10}\).65) : (2\(^8\).104)
C = 2\(^{10}\).(13 + 65):(2\(^8\).104)
C = 2\(^{10}\).78 : (2\(^8\).104)
C = (2\(^{10}\) : 2\(^8\)).(78 : 104)
C = 2\(^2\).\(\frac34\)
C = 3
a) $3^8:3^6=3^{8-6}=3^2$
$19^7:19^3=19^{7-3}=19^4$
$2^{10}:8^3=2^{10}:(2^3)^3=2^{10}:2^9=2^{10-9}=2^1$
$12^7:6^7=(12:6)^7=2^7$
$27^5:81^3=(3^3)^5:(3^4)^3=3^{15}:3^{12}=3^{15-12}=3^3$
b) $10^6:10=10^{6-1}=10^5$
$5^8:25^2=5^8:(5^2)^2=5^8:5^4=5^{8-4}=5^4$
$4^9:64^2=4^9:(4^3)^2=4^9:4^6=4^{9-6}=4^3$
$2^25:32^4=2^{25}:(2^5)^4=2^{25}:2^{20}=2^{25-20}=2^5$
$18^3:9^3=(18:9)^3=2^3$
\(\cdot3^8:3^6=3^{8-6}=3^2\)
\(\cdot19^7:19^3=19^{7-3}=19^4\)
\(\cdot2^{10}:8^3=2^{10}:\left(2^3\right)^3=2^{10}:2^9=2\)
\(\cdot12^7:6^7=\left(12:6\right)^7=2^7\)
\(\cdot27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)
\(\cdot10^6:10=10^{6-1}=10^5\)
\(\cdot5^8:25^2=5^8:\left(5^2\right)^2=5^8:5^4=5^4\)
\(\cdot4^9:64^2=4^9:\left(4^3\right)^2=4^9:4^6=4^3\)
\(2^{25}:32^4=2^{25}:\left(2^5\right)^4=2^{25}:2^{20}=2^5\)
\(18^3:9^3=\left(18:9\right)^3=2^3\)
\(5^8:25^2=5^8:5^4\)
=54=625
\(4^9:64^2=4^9:\left(2^2\right)^6\)
=49:46
=43=64
Tách ra đi bn!