Question

Tính bằng 2 cách:

a) 2³.2²             c) 5⁷:5⁶

b) 3².3³             d) 7⁴:7²

Answer 1

a)Cách 1

\(2^3.2^2=2^{\left(2+3\right)}=2^5=32\)

 Cách 2

\(2^3.2^2=8.4=32\)

Answer 2

d)

Cách 1

\(7^4:7^2=7^{\left(4-2\right)}=7^2=49\)

Cách 2

\(7^4:7^2=2041:49=49\)

Answer 3

b) Cách 1

\(3^2.3^3=3^{\left(2+3\right)}=3^5=243\)

 Cách 2

\(3^2.3^3=9.27=243\)

Answer 4

C)

Cách 1

\(5^7:5^6=5^{\left(7-6\right)}=5^1=5\)

Cách 2

\(5^7:5^6=78125:15625=5\)