Question

Tính bằng hai cách :

A)2¹⁰:2⁸

B)4^6:4³

C)8⁵:8⁴

D)7^4:7⁴

Answer 1

A)2¹⁰:2⁸

C1:  2¹⁰:2⁸=1024:256

=4

C2:  2¹⁰:2⁸=2^10-8=2²=4

B)4^6:4³

C1:   4^6:4³=4096:64=64

C2:   4^6:4³=4^6-3=4³=64

C)8⁵:8⁴

C1:   8⁵:8⁴=32768:4096=8

C2    8⁵:8⁴=8^5-4=8¹=8

D)7^4:7⁴

C1:    7^4:7⁴=2401:2401=1

C2    7^4:7⁴=7^4-4=7⁰=1

Answer 2

a) \(C1:2^{10}\div2^8=2^{10-8}=2^2=4\)

    \(C2:2^{10}\div2^8=1024\div256=4\)

b) \(C1:4^6\div4^3=4^{6-3}=4^3=64\)

    \(C2:4^6\div4^3=4096\div64=64\)

c) \(C1:8^5\div8^4=8^{5-4}=8^1=8\)

     \(C2:8^5\div8^4=\left(2^3\right)^5\div\left(2^3\right)^4=2^{15}\div2^{12}=2^{15-12}=2^3=8\)

d) \(C1:7^4\div7^4=1\)

     \(C2:7^4\div7^4=2401\div2401=1\)

Answer 3

a) \(C1:2^{10}\div2^8=2^{10-8}=2^2=4\)

\(C2:2^{10}\div2^8=1024\div256=4\)

b) \(C1:4^6\div4^3=4^{6-3}=4^3=64\)

\(C2:4^6\div4^3=4096\div64=64\)

c) \(C1:8^5\div8^4=8^{5-4}=8^1=8\)

\(C2:8^5\div8^4=\left(2^3\right)^5\div\left(2^3\right)^4=2^{15}\div2^{12}=2^{15-12}=2^3=8\)

d) \(C1:7^4\div7^4=1\)

\(C2:7^4\div7^4=2401\div2401=1\)

Hk tốt