a) \(25^3:5=5^{6-1}=5^4=625\)

Học tốt~

trắc nghiệm

câu 1: c

câu 2: B

câu 3: D

câu 4: A

câu 5: C

câu 6: D

tự luận

câu 1:

a)M(x) = x⁴ + 2x² + 1

b) M(x) + N(x) = -4x⁴ + x³ + 5x² - 2

M(x) - N(x) = 6x⁴ - x³ - x² + 4

c) \(M\left(-\dfrac{1}{2}\right)=\left(-\dfrac{1}{2}\right)^4+2\left(-\dfrac{1}{2}\right)^2+1=\dfrac{25}{16}\)

Ta có : a) \(2^{24}=2^{6.4}=2^{4^6}=16^6\)

( số còn lại sai đề bạn ơi )

b) tương tự \(2^{27}=2^{3^9}=8^9\)

\(3^{18}=3^{2^9}=9^9\)

bài 2: a) \(x^{14}=x^7.x^7\)

b) chịu

c) \(x^{12}:x^{-2}\)

nhớ tick nhé!

Tim chu so tan cung cua luy thua sau 2 mu 100

1.\(45^{10}.5^{30}=45^{10}.125^{10}=\left(45.125\right)^{10}=5625^{10}\)

2.a. \(\left(2x-1\right)^3=-8\Leftrightarrow\left(2x-1\right)^3=\left(-2\right)^3\)

\(\Leftrightarrow2x-1=-2\Leftrightarrow x=-\frac{1}{2}\)

b.\(\left(x+\frac{1}{2}\right)^2=\frac{1}{16}\Leftrightarrow\orbr{\begin{cases}x+\frac{1}{2}=\frac{1}{4}\\x+\frac{1}{2}=-\frac{1}{4}\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-\frac{1}{4}\\x=-\frac{3}{4}\end{cases}}\)

c. \(\left(2x+3\right)^2=\frac{9}{121}\Leftrightarrow\orbr{\begin{cases}2x+3=\frac{3}{11}\\2x+3=-\frac{3}{11}\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=-\frac{15}{11}\\x=-\frac{18}{11}\end{cases}}\)

d.\(\left(3x-1\right)^3=-\frac{8}{27}=\left(-\frac{2}{3}\right)^3\)

\(\Leftrightarrow3x-1=-\frac{2}{3}\Leftrightarrow x=\frac{1}{9}\)

4.

a.\(99^{20}=\left(99^2\right)^{10}=9801^{10}\)

Do \(9801^{10}< 9999^{10}\Rightarrow99^{20}< 9999^{10}\)

b.\(3^{4000}=\left(3^2\right)^{2000}=9^{2000}\)

\(\Rightarrow3^{4000}=9^{2000}\)

c.\(2^{332}=\left(2^3\right)^{110}.2^2=8^{110}.4\)

\(3^{223}=\left(3^2\right)^{110}.3^3=\left(3^2\right)^{110}.9=9^{110}.9\)

Ta thấy \(4.8^{110}< 9.9^{110}\)

Vậy \(2^{332}< 3^{223}\)