Mathematics
Undergraduate
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logの計算問題です。この6問の解き方が分からず困っています。どなたか解ける方教えていただきたいです🙇♀️
(3) (2)と同様に<8であるが,真数条件x>0より0<x<8
問 4.15 次の方程式と不等式を解け.
(1) log₁ x = −1
(4) log3 3x = 4
(2) log3x≧2
(5) log3(x+2) < 2
例題 次の方程式を解け.
(3)
(6)
Let's TRY
logyx<2
log(x - 2) < 2
単調増加.
log2 4
(1) < 1, 1 < log₂ 3, 1 < log4 7 = 102 = log2 7 = log₂ √7 <
(2) log, 5 log3 √5,= log3 √3 £
log₂ √9 = log₂ 3
,
< log4 7 < log₂ 3
=
h),
log3 2 < logg 5
4.15 (1) x =
(/) -1
(2) x ≥ 9
(3) x> // 9
(4) x = 27 (5) -2 < x < 7
(6)
4.16 (1) x = 5 (2) 0 < x≤ 1
4.5節 4.17 log10 (20
4.
=
(3)
- 20 log10
3
9
x > ²
= 2
2 < x < 5
=
-20 × 0.4771 = -9.542. だから,
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底が1より小さい時には、大小逆になります！