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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.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
=298:22=298-2=296
=326:38=326-8=318
Mấy bài khác bn lm tương tự
35 . 45 = ( 3.4 )5 = 125
85 . 23 = ( 24 )5 . 23 = 220 . 23 = 220 + 3 = 223
kb với mk nha các bạn
a, 3^5 . 4^5 = ( 3.4 )^5 = 12^5
b, 8^5 . 2^3 = 2^3.5 . 2^3 =2^15 . 2^3 = 2^18
Đúng nha
a) \(3^3.3^4=3^{3+4}=3^7\)
b) \(5^2.5^7=5^{2+7}=5^9\)
c) \(7^5.7=7^{5+1}=7^6\)
a. 2^3 . 2^2 . 2^4
= 2^9
b. 10^2 . 10^3 . 10^5
= 10^10
c. x. x^5
= x^6
d. a^3 . a^2 . a^5
= a^10
a) \(2^3.2^2.2^4\)
\(=2^{3+2+4}\)
\(=2^9\)
b) \(10^2.10^3.10^5\)
\(=10^{2+3+5}\)
\(=10^{10}\)
c) \(x.x^5=x^1.x^5=x^6\)
d) \(a^3.a^2.a^5=a^{3+2+5}=a^{10}\)
\(3^5\cdot4^5=\left(3\cdot4\right)^5=12^5\)
\(8^5\cdot2^3=2^{15}\cdot2^3=2^{18}\)
Hok tốt
\(3^5.4^5=\left(3.4\right)^5=12^5\)
\(8^5.2^3=\left(2^3\right)^5.2^3=2^{15}.2^3=2^{18}\)
\(a,11^8:11^3=11^5\)
\(b,17^{11}:17^9=17^2\)
\(c,4^3:2^2=\left(2^2\right)^3:2^2=2^6:2^2=2^4\)
\(d,a^5:a=a^4\)
!!!
\(a)11^8\div11^3=11^{8-3}=11^5\)
\(b)17^{11}\div17^9=17^{11-9}=17^2\)
\(c)4^3\div2^2=4^3\div4=4^2\)
\(d)a^5\div a=a^4\)
a) \(3^3 : 3^2\)=\(3^{3-2}=3^1\)
b) \(5^{4} : 5^{2}\)=\(5^{4-2}=5^2\)
c) \(8^{3} . 8^{2}\)=\(8^{3+2}=8^5\)
d) Cách 1:
\(5^{4} . 5^{3}: 5^{2}=5^{4+3}:5^2=5^7:5^2=5^{7-2}=5^5\)
Cách 2:
\(5^{4} . 5^{3}: 5^{2}=5^{4+3-2}=5^5\)