Question

giải nhanh nha

Answer 1

1. 

a. $125=5^3$

b. $27=3^3$

c. $128=2^7$

d. $512=8^3$

Answer 2

2.

a.

$4^4.4^5=4^{4+5}=4^9$

$27.3^5=3^3.3^5=3^{3+5}=3^8$

$32.64=2^5.2^6=2^{5+6}=2^{11}$

b.

$9^8:9=9^{8-1}=9^7$

$128:2^4=2^7:2^4=2^{7-4}=2^3$
$3^9:243=3^9:3^5=3^{9-5}=3^4$

c.

$3.12^6.4.12^4=(3.4).12^6.12^4=12.12^6.12^4=12^{1+6+4}=12^{11}$

$15^6.3.15^3.5=15^6.15.15^3=15^{6+1+3}=15^{10}$

$21^3.7.21^4.3=21^3.21.21^4=21^{3+1+4}=21^8$

Answer 3

3.

1 - c

2 - b

3 - a

4 - Không có kq nào đúng để nối.

Answer 4

4.

a. $5^x.25=125$

$5^x.5^2=5^3$

$5^x=5^3:5^2=5^1$

$x=1$

b. $243:3^x=27$

$3^5:3^x=3^3$

$3^x=3^5:3^3=3^2$

$x=2$

c. $2^{x+2}=64=2^6$

$x+2=6$

$x=4$