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x7 .x.x4 = x.x.x.x.x.x.x.x.x.x.x.x = x12
ko bt đúng hay sai nhưng ... thôi kệ !
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.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
a) 23 . 22 . 24
= 22+3+4
= 29
b) 102 . 103 . 105
= 102+3+5
= 1010
c) x . x5
= x1+5
= x6
d) a3 . a2 . a5
= a3+2+5
= a10
\(2^3\cdot2^2\cdot2^4=2^{3+2+4}=2^9\)
\(10^2\cdot10^3\cdot10^5=10^{2+3+5}=10^{10}\)
\(x\cdot x^5=x^6\)
\(a^3\cdot a^2\cdot a^5=a^{3+2+5}=a^{10}\)
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) \(a^3.a^2.a^5=a^{3+2+5}=a^{10}\)
a) \(a^3.a^5=a^{3+5}=a^8\)
b) \(x^7.x.x^4=x^{7+1+4}=x^{12}\)
c) \(3^5.4^5=\left(3.4\right)^5=12^5=248831\)
d) \(8^5.2^3=8^2.\left(8.2\right)^3=64.16^3=262144\)
a)a3*a5=a8
b)x7*x*x4=x12
c)35*45=(3*4)5=125
d)85*23=215*23=218
a) 23; 24 ; 25
23=8
24=16
25=32
NGUYỄN NHẬT MINH 6A THCS QUANG THỊNH 2021-2022