Ex log ab log ab log a b
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Ex :
. . . . ﻛﻦ ﺣﺬﺭﺍ • • • log (a+b) ≠ log (a-b) ≠ log (a * b) ≠ log (a/b) ≠ log (1/a) ≠ log a + log b log a – log b (log a)(log b) (log a)/(log b) 1/(log a)
1 ﺗﻄﺒﻴﻖ log 53≈. 683 & log 57≈1. 209 ﺇﺫﺍ ﻛﺎﻥ • log 53/7 = • log 53 – log 57 ≈ • . 683 – 1. 209 = • -. 526 • log 521 = • log 5(3· 7)= • log 53 + log 57≈ • . 683 + 1. 209 = • 1. 892
2 ﺗﻄﺒﻴﻖ log 53≈. 683 & log 57≈1. 209 ﺇﺫﺍ ﻛﺎﻥ • log 549 = 2 • log 57 = • 2 log 57 ≈ • 2(1. 209)= • 2. 418
• log 5 mn = • log 5 + log m + log n • log 5 = • log 58 + 3·log 5 x 3 8 x 4 ﺗﻄﺒﻴﻖ
❷log 57 + 3·log 5 t = • log 57 t 3 ❸ 3 log 2 x – (log 24 + log 2 y)= • log 2
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