\(3^8\cdot2^7\)

\(=3^7\cdot2^7\cdot3\)

\(=\left(3\cdot2\right)^7\cdot3=6^7\cdot3\)

\(=839808\)

\(3^8\times2^7=3^7\times3\times2^7=\left(3\times2\right)^7\times3=6^7\times3\)

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

9^8:3^2=(3^2)^8:3^2=3^16:3^2=3^16-2=3^14

\(2^4.8=2^4.2^2=2^6=64\)

Sorry Tui nhầm .. 

\(2^4.8=2^4.2^3=2^7=124\)

2.4.8

=2\(^1\).2\(^2\).2\(^3\)

=2\(^{\left(1+2+3\right)}\)

=2\(^6\)

=64

1) 3⁵ . 4⁵ = (3.4)⁵ = 12⁵

2) 8⁵ . 2³ = 2¹⁵ . 2³ = 2¹⁸

3^5. 4^5 = {3.4}^5 =12^5

8^5 .2^3 = 2^15.2^3 =2^18

thank you 2 ban

\(8^5.2^3\)

\(=\left(2^3\right)^5.2^3\)

\(=2^{15}.2^3\)

\(=2^{18}\)

Ta có: \(8^5=\left(2^3\right)^5=2^{15}\)

\(\Rightarrow8^5.2^3=2^{15}.2^3=2^{18}\)

Đáp số: \(2^{18}\)

4² x 8³

= ( 2² ) ² x  (  2³ ) ³

= 2⁴ x 2⁹ = 2¹³

4^2*8^3

=(2^2)^2*(2^3)^3

=2^4*2*9

=2^13

4²x8³=4²x(8x8)²=4²x64²=(4.64)²=256²

= 85 x 85 - 84 x 84 = 85 x 84 + 85 - 84 x 84 = 84 x 84 + 84 + 85 - 84 x 84 = (84 x 84 - 84 x 84) + 85 + 84 = 169 = 13^2

= 13^2 nhaaaaaaa

85^2 - 84^2 = (85-84).(85+84)=169=13^2

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