Toán Lớp 7: Bài 1 : tính 1) (0,125)^3 . 512 2 ) ( 0,25)^4 . 1024 3) 90^3/15^3 4) 790^79/79^4 5) 3^2/(0,375)^2 6) 2^6 . 5^6 7) 4^3 . 5^3 8) 6^3

Question

Toán Lớp 7:  Bài 1 : tính  1)  (0,125)^3 . 512  2 ) ( 0,25)^4 . 1024 3) 90^3/15^3 4) 790^79/79^4 5) 3^2/(0,375)^2 6) 2^6 . 5^6  7) 4^3 . 5^3  8) 6^3 . 5^3  9) 8^2 . 5^2  10 ) 25 . 5^3.1/625 .5^2 11) 4.32 : (2^3 . 1/6) 12) 5^2 .3^5 . (3/5)^2 13) ( 1/7 )^2 . 1/7 . 49^2 14) 3^2 . 1/243 . 81^2 . 1/3^3 15 ) ( 4 . 2^5 ) : (2^3 . 1/16 )

maianh67 · Answer

Lời giải và giải thích chi tiết:     1)   (0,125)^3 . 512   = (0,125)^3 . 8^3   = 1^3   = 1   2)   (0,25)^4 . 1024   = (0,25)^4 . 4^4 . 4   = 1 . 4   = 4   3)   (90^3)/(15^3)   = 6^3   = 216   4)   (790^4)/(79^4)   = (790/79)^4   = 10^4   = 10000   5)   (3^2)/((0,375)^2)   = 8^2   = 64   6)   2^6 . 5^6   = 10^6   = 1000000   7)   4^3 . 5^3   = 20^3   = 8000   8)   6^3 . 5^3    = 30^3   = 27000   9)   8^2 . 5^2   = 40^2   = 1600   10)   (25 . 5^3 . 1)/(625 . 5^2)   = (5^5)/(5^5)   = 1   11)   4 . 32 : (2^3 . 1/6)   = 2^2 . 2^5 : 4/3   = 2^7 . 3/4   = 2^5 . 3   = 96   12)   5^2 . 3^5 . (3/5)^2   = 5^2 . (3/5)^2 . 3^5   = 3^2 . 3^5   = 3^7   = 2187   13)   (1/7)^2 . 1/7 . 49^2   = (1/7)^2 . 49^2 . 1/7   = 7^2 . 1/7   = 7   14)   3^2 . 1/243 . 81^2 . 1/(3^3)   = 3^2 . 3^8 . 1/(3^3) . 1/(3^5)   = 3^2   = 9   15)   (4 . 2^5) : (2^3 . 1/16)   = 2^7 : 1/2   = 2^6   = 64