câu trả lời: D

a)10⁸.2⁸=(10.2)⁸=20⁸

b)10⁸:2⁸=(10:2)⁸=5⁸

c)25⁴.2⁸=(5²)⁴.2⁸=5^2.4.2⁸=5⁸.2⁸=(5.2)⁸=10⁸

a. 10 mũ 8 . 2 mũ 8 = 10 . 2 mũ 8 = 20 mũ 8

b. 10 mũ 8 : 2 mũ 8 = 10 : 2 mũ 8 = 5 mũ 8

c . 25 mũ 4 . 2 mũ 8 = 390625 . 64 = 25000000

Rickroll

mở SGK ra XEM LẠI cách làm!

kq: 5⁶

5⁴ x 5² = 5⁴⁺² = 5⁶

5⁴ + 5² = 5⁴⁺² = 5⁶

a: \(3\cdot3\cdot3\cdot3\cdot3=3^5\)

b: \(y\cdot y\cdot y\cdot y=y^4\)

c: \(5\cdot p\cdot5\cdot p\cdot2\cdot q\cdot4\cdot q=25\cdot2\cdot4\cdot p^2q^2=2\cdot\left(10qp\right)^2\)

d: \(a\cdot a+b\cdot b+c\cdot c+d\cdot d\cdot d\cdot d=a^2+b^2+c^2+d^4\)

a) 3.3.3.3.3 = 3\(^5\)

b) y.y.y.y = y\(^4\)

c) 5.p.5.p.2.q.4.q = 5\(^2\).p\(^2\).q\(^2\).2\(^3\) 

(2\(^3\) ở đây là vì 2.4 = 2.2.2 = 2\(^3\))

d) a.a + b.b + c.c.c + d.d.d.d = a\(^2\)+b\(^2\)+c\(^3\)+d\(^4\)

1.
a) \(3^4\times3^5\times3^6=3^{4+5+6}=3^{15}\)

b) \(5^2\times5^4\times5^5\times25=5^2\times5^4\times5^5\times5^2=5^{2+4+5+2}=5^{13}\)

c) \(10^8\div10^3=10^{8-3}=10^5\)

d) \(a^7\div a^2=a^{7-2}=a^5\)

2.

\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)

\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)

\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)

còn bài 2

\(\begin{array}{l}a){( - 2)^3}.{( - 2)^4} = {( - 2)^{3 + 4}} = {( - 2)^7}\\b){(0,25)^7}:{(0,25)^3} = {(0,25)^{7 - 3}} = {(0,25)^4}\end{array}\)

b)  3 8 . 3 16 : 3 7 . 3 14  = 3 24 : 3 21 = 3 3

a)  6 2010 : 6 10  = 6 2000