1)Đưa về lũy thừa cùng cơ số 2

8²=  \(\left(2^3\right)^2=2^6\)        32³= \(\left(2^5\right)^3=2^{15}\)          64⁴= \(\left(2^6\right)^4=2^{24}\)       4³= \(\left(2^2\right)^{^3}=2^6\)

2)Đưa về lũy thừa cùng cơ số 3

9³= \(\left(3^2\right)^3=3^6\)       27⁴=  \(\left(3^3\right)^4=3^{12}\)      9⁵= \(\left(3^2\right)^5=3^{10}\)      81⁶=   \(\left(3^4\right)^6=3^{24}\)

3)Đưa về lũy thừa cùng cơ số 2

 8³:4²= \(\left(2^3\right)^3:\left(2^2\right)^2=2^9:2^4=2^5\)    16²:32= \(\left(2^4\right)^2:2^5=2^8:2^5=2^3\)    

\(64^4:4^3=\left(2^6\right)^4:\left(2^2\right)^3=2^{24}:2^6=2^{18}\)    32³:8²= \(\left(2^5\right)^3:\left(2^3\right)^2=2^{15}:2^6=2^9\)

Bạn giải nốt hộ mình câu 4,,5,6 mình cảm ơn nhìu

4)Đưa về lũy thừa cùng cơ số 3

27⁴:9³=\(\left(3^3\right)^4:\left(3^2\right)^3=3^{12}:3^6=3^6\)    81^6:9⁵=  \(\left(3^4\right)^6:\left(3^2\right)^5=3^{24}:3^{10}=3^{14}\)   

9⁶ .27⁴:81⁵=\(\left(3^2\right)^6.\left(3^3\right)^4:\left(3^4\right)^5=3^{12}.3^{12}:3^{20}=3^4\)

5)Đưa về lũy thừa cùng cơ số 5

25⁷=  \(\left(5^2\right)^7=5^{14}\)    125³=  \(\left(5^3\right)^3=5^9\)   25⁷:5⁶=  \(\left(5^2\right)^7:5^6=5^{14}:5^6=5^8\)

125⁶:25⁷= \(\left(5^3\right)^6:\left(5^2\right)^7=5^{18}:5^{14}=5^4\)

6)Đưa về lũy thừa cùng cơ số 4

16²= \(\left(4^2\right)^2=4^4\)     64³=\(\left(4^3\right)^3=4^9\)      (128:2)³=\(64^3=\left(4^3\right)^3=4^9\)     2².2²=\(4.4=4^2\)

5 y y = ( 5 y ) 2 . y   = 25. y 2 . y = 25. y 3

Chọn đáp án D

a) \(\sqrt{128\left(x-y\right)^2}\)

\(=\sqrt{8^2\cdot2\left(x-y\right)^2}\)

\(=\left|8\left(x-y\right)\right|\sqrt{2}\)

\(=8\left|\left(x-y\right)\right|\sqrt{2}\)

b) \(\sqrt{150\left(4x^2-4x+1\right)}\)

\(=\sqrt{5^2\cdot6\left(2x-1\right)^2}\)

\(=\left|5\left(2x-1\right)\right|\sqrt{6}\)

\(=5\left|2x-1\right|\sqrt{6}\)

c) \(\sqrt{x^3-6x^2+12x-8}\)

\(=\sqrt{\left(x-2\right)^3}\)

\(=\sqrt{\left(x-2\right)^2\left(x-2\right)}\)

\(=\left|x-2\right|\sqrt{x-2}\)

a: \(=\sqrt{64\cdot2\cdot\left(x-y\right)^2}=8\sqrt{2}\cdot\left|x-y\right|\)

b; \(=\sqrt{25\cdot6\left(2x-1\right)^2}=5\sqrt{6}\cdot\left|2x-1\right|\)

c: \(=\sqrt{\left(x-2\right)^3}=\left|x-2\right|\cdot\sqrt{x-2}\)

8 y 2 = 4 . 2 y 2 = 2 y 2 = - 2 y 2 ( với y < 0 )

\(\frac{1}{x-y}.\sqrt{x^4\left(x^2+y^2-2xy\right)}\)

\(=\frac{1}{x-y}.\sqrt{\left(x^2\right)^2.\left(x-y\right)^2}\)

\(=\frac{1}{x-y}\left(x-y\right)x^2\)

\(=x^2\)

a: \(xy^2\sqrt{x}=\sqrt{x^2y^4\cdot x}=\sqrt{x^3y^4}\)

b: \(\dfrac{2}{x}\sqrt{\dfrac{15xy}{4}}=-\sqrt{\dfrac{4}{x^2}\cdot\dfrac{15xy}{4}}=-\sqrt{\dfrac{15y}{x}}\)

b)  63 y 3 7 y với y > 0

=  63 y 3 7 y = 9 y 2 = 3 y = 3 y do y > 0

\(x\sqrt{y}=-\sqrt{x^2\cdot y}\)