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

A=có cần đọc cách làm ko bạn

A, B, C,... là tên của bài bạn nha

VD: A, 15+x=15

      B, 16+14+14+14

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) $10^6:10=10^{6-1}=10^5$

$5^8:25^2=5^8:(5^2)^2=5^8:5^4=5^{8-4}=5^4$

$4^9:64^2=4^9:(4^3)^2=4^9:4^6=4^{9-6}=4^3$

$2^25:32^4=2^{25}:(2^5)^4=2^{25}:2^{20}=2^{25-20}=2^5$

$18^3:9^3=(18:9)^3=2^3$

\(\cdot3^8:3^6=3^{8-6}=3^2\)

\(\cdot19^7:19^3=19^{7-3}=19^4\)

\(\cdot2^{10}:8^3=2^{10}:\left(2^3\right)^3=2^{10}:2^9=2\)

\(\cdot12^7:6^7=\left(12:6\right)^7=2^7\)

\(\cdot27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)

\(\cdot10^6:10=10^{6-1}=10^5\)

\(\cdot5^8:25^2=5^8:\left(5^2\right)^2=5^8:5^4=5^4\)

\(\cdot4^9:64^2=4^9:\left(4^3\right)^2=4^9:4^6=4^3\)

\(2^{25}:32^4=2^{25}:\left(2^5\right)^4=2^{25}:2^{20}=2^5\)

\(18^3:9^3=\left(18:9\right)^3=2^3\)

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, \(\frac{25^{11}.4^{33}}{8^{15}.10^{22}}=\frac{\left(5^2\right)^{11}.\left(2^2\right)^{33}}{\left(2^3\right)^{15}.\left(2.5\right)^{22}}=\frac{5^{22}.2^{66}}{2^{45}.2^{22}.5^{22}}=\frac{5^{22}.2^{66}}{2^{67}.5^{22}}=\frac{1}{2}\)

b,\(\frac{8^4.5^8.9^3}{125^3.4^7.27}=\frac{\left(2^3\right)^4.5^8.\left(3^2\right)^3}{\left(5^3\right)^3.\left(2^2\right)^7.3^3}=\frac{2^{12}.5^8.3^6}{5^9.2^{14}.3^3}=\frac{3^3}{5.2^2}=\frac{27}{20}\)

Bạn làm nốt nhé cũng tương tự thôi !!!!!!!!!

\(ĐS=-\frac{3}{2}\)

chúc bạn hk tốt!!!