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a) \(7^5.7^6=7^{5+6}=7^{11}\)
b) \(5^{20}.5=5^{20+1}=5^{21}\)
c) \(7^9:7=7^{9-1}=7^8\)
d) \(25^3.5^2=\left(5^2\right)^3.5^2=5^{2.3}.5^2=5^6.5^2=5^{6+2}=5^8\)
a)\(3^2.9^3=9.9^3=9^{1+3}=9^4\)
b)\(2^2.5^2=4.25=100=10^2\)
c)\(8^5.2^3=8^5.8=8^{5+1}=8^6\)
d)\(9^8:3^2=9^8:9=9^{8-1}=9^7\)
\(16^2:4^2\)
\(=\left(4^2\right)^2:4^2\)
\(=4^4:4^2\)
\(=4^{4-2}\)
\(=4^2\)
==========
\(25^5:5^2\)
\(=\left(5^2\right)^5:5^2\)
\(=5^{10}:5^2\)
\(=5^{10-2}\)
\(=5^8\)
============
\(9^8:3^2\)
\(=\left(3^2\right)^8:3^2\)
\(=3^{16}:3^2\)
\(=3^{16-2}\)
\(=3^{14}\)
===========
\(a^6:a\)
\(=a^{6-1}\)
\(=a^5\)
a) 274.92 = 312.34 = 316
b) 43.84 = 26.212 = 218
c) 165.642 = 220.212 = 232
a,�,
220.15+210.85220.15+210.85
=220.210.85+15=220.210.85+15
=230.100=230.100
=230.102=230.102
b,�,
2716:9102716:910
=(33)16:(32)10=(33)16:(32)10
=348:320=348:320
=328=328
c,�,
1253:2541253:254
=(53)5:(52)4=(53)5:(52)4
=515:58=515:58
=57=57
d,�,
244:34−3212:1612244:34−3212:1612
=(24:3)4−(32:16)12=(24:3)4−(32:16)12
=84−212=84−212
=(23)4−212=(23)4−212
=212−212=212−212
Câu a,b bạn biết rồi nên mình không cần ghi ha =))
c) \(9^8:3^2=\left(3^2\right)^8:3^2=3^{16}:3^2=3^{16-2}=3^{14}\)
Chúc bạn học tốt.
9^8/3^2=(3^2)^8/3^2
=3^16/3^2
=3^16-2
=3^14