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4510.530
=(32.5)10.530
=(32)10.510.530
=320.540
=320.(52)20
=320.2520
=(3.5)20
=7520
4510.530=320.510.530=320.540=320.(52)20=7520
->điều phải chứng minh.
\(75^{20}=\left(5^2\right)^{20}.3^{20}=5^{40}.3^{20}\); \(45^{10}.5^{30}=\left(3^2\right)^{10}.5^{10}.5^{30}=3^{20}.5^{40}\)
Vậy \(75^{20}=45^{10}.5^{30}\left(=5^{40}.3^{20}\right)\)
a) Ta có: 128 = 38 . 216 và 912 = 324
=> 128 . 912 = 38 . 216. 324 = 216 . 332 = 216 . (32)16 = 216 . 916 = (2.9)16 = 1816
Vậy 128 . 912 = 1816
b) Ta có: 4510 = 510 . 320
=> 4510 . 530 = 320. 510 . 530 = 320 . 540 = 320 . (52)20 = 320 . 2520 = (3.25)20 = 7520
Vậy 4510 . 530 = 7520
a/ \(12^8.9^{12}=\left(2^2.3\right)^8.\left(3^2\right)^{12}=2^{16}.\left(3^2\right)^4.\left(3^2\right)^{12}=2^{16}.\left(3^2\right)^{16}=\left(2.9\right)^{16}=18^{16}\)
b/ \(75^{20}=\left(3.25\right)^{20}=\left(3^2\right)^{10}.\left(5^2\right)^{20}=9^{10}.5^{40}=9^{10}5^{10}.5^{30}=\left(9.5\right)^{10}.5^{30}=45^{10}.5^{30}\)
\(75^{20}=45^{10}\cdot5^{30}=45^{10}\cdot125^{10}=5625^{10}=75^{20}\)
\(75^{20}=\left(3.5^2\right)^{20}\)
\(=3^{20}.5^{40}\)
\(=\left(3^2\right)^{10}.5^{10}.5^{10}.5^{20}\)
\(=\left(3^2.5\right)^{10}.5^{30}\)
\(=\left(5.9\right)^{10}.5^{30}\)
\(=45^{10}.5^{30}\)
Vậy \(75^{20}=45^{10}.5^{30}\)
xem trong sbt toan nhe ban trong do co 2 cau
lan giai va chi tiet nhe
4510 . 530
= 4510 . (53)10
= 4510 . 12510
= ( 45 . 125 )10
= 562510
= (752)10
= 7520 (đpcm)
=))
a,\(12^8\times9^{12}\)
\(=3^8\times2^{16}\times3^{16}\times3^8\)
\(=2^{16}\times3^{16}\times3^{16}\)
\(=18^{16}\)
b,\(75^{20}=3^{10}\times3^{10}\times5^{10}\times5^{10}\times5^{20}=45^{10}\times5^{30}\)
Ta có :
\(75^{10}.75^{10}=\left(5^{10}.3^{10}.3^{10}\right).\left(5^{10}.5^{10}.5^{10}\right)\)
\(75^{10}.75^{10}=\left(5^{10}.5^{10}.3^{10}\right).\left(5^{10}.5^{10}.3^{10}\right)\)
\(75^{10}.75^{10}=75^{10}.75^{10}\)
Vì vậy : \(75^{20}=45^{10}.5^{30}\)
\(75^{20}=3^{20}.5^{40}\)
\(45^{10}.5^{30}=3^{20}.5^{40}\)
Do đó:\(75^{20}=45^{10}.5^{30}\)(đpcm)