3. А) Расходится
lim (n/6n+4)
n→+∞
lim (n/n×(6+4/n))
lim(1/6+4/n)
1/6+4×0 = 1/6
Б) Расходится
lim ( | (n+1+1)! / 9^n+1 / (n+1)! / 9^n | )
lim ((n+2)! / 9^n+1 / (n+1)! / 9^n)
lim( (n+2)! / 9×(n+1)! )
lim ( (n+2)×(n+1)! / 9×(n+1)! )
lim (n+2/9)
lim (1/9 × (n+2) )
1/9 × lim (n+2)
+∞
4. f 1/2×(cos(-6x)+cos(10x))dx
f 1/2×(cos6x+cos10x)dx
½ × f cos6x+cos10x dx
½ ( f cos6xdx + f cos10xdx)
½ (sin6x/6 + sin10x/10)
sin6x/12+sin10x/20 + C, C€R
5. A) Сходится
lim (1/3n+1)
lim (1) lim(3n+1)
n→+∞ n→+∞
1 +∞
Выражение а/±∞ определено как 0
1/3n+1 ≥ 1/3(n+1)+1
Истина
Б) Сходится
lim ( 1/(n+17)!)
lim (1) lim((n+17)!)
a/±∞ определено как 0, поэтому 0
1/(n+17)! ≥ 1/(n+1+17)!
X - 24 5/8 = 30 5/6 + 41 7/12
X - 24 5/8 = 30 10/12 + 41 7/12
X - 24 5/8 = 71 17/12
X - 24 5/8 = 72 5/12
X = 72 5/12 + 24 5/8 =
x= 72 10/24 + 24 15/24
x= 96 25/24
x = 97 1/24
X - 49 7/12 = 51 15/18 + 10 1/18
X-49 7/12 = 61 16/18
X - 49 7/12 = 61 8/9
x= 61 8/9 + 49 7/12
x = 61 32/36 +49 21/36
X = 110 53/36
x = 111 17/36
X-92 3/10 = 8 19/20 + 4 2/15
X-92 3/10 = 8 57/60 + 4 8/60
X-92 3/10 = 12 65/60
X-92 3/10 = 13 5/60
X-92 3/10 = 13 1/12
x= 13 1/12 + 92 3/10
x= 13 5/60 + 92 18/60
x= 105 23/60
X - 44 13/15 = 44 1/21 + 50 2/35
X - 44 13/15 = 44 5/105 + 50 6/105 =
X - 44 13/15 = 94 11/105
x = 94 11/105 + 44 13/15
x= 94 11/105 + 44 91/105
x= 138 102/105
x = 138 34/35
3. А) Расходится
lim (n/6n+4)
n→+∞
lim (n/n×(6+4/n))
n→+∞
lim(1/6+4/n)
n→+∞
1/6+4×0 = 1/6
Б) Расходится
lim ( | (n+1+1)! / 9^n+1 / (n+1)! / 9^n | )
n→+∞
lim ((n+2)! / 9^n+1 / (n+1)! / 9^n)
n→+∞
lim( (n+2)! / 9×(n+1)! )
n→+∞
lim ( (n+2)×(n+1)! / 9×(n+1)! )
n→+∞
lim (n+2/9)
n→+∞
lim (1/9 × (n+2) )
n→+∞
1/9 × lim (n+2)
n→+∞
+∞
4. f 1/2×(cos(-6x)+cos(10x))dx
f 1/2×(cos6x+cos10x)dx
½ × f cos6x+cos10x dx
½ ( f cos6xdx + f cos10xdx)
½ (sin6x/6 + sin10x/10)
sin6x/12+sin10x/20 + C, C€R
5. A) Сходится
lim (1/3n+1)
n→+∞
lim (1) lim(3n+1)
n→+∞ n→+∞
1 +∞
Выражение а/±∞ определено как 0
1/3n+1 ≥ 1/3(n+1)+1
Истина
Б) Сходится
lim ( 1/(n+17)!)
n→+∞
lim (1) lim((n+17)!)
n→+∞ n→+∞
1 +∞
a/±∞ определено как 0, поэтому 0
1/(n+17)! ≥ 1/(n+1+17)!
Истина
X - 24 5/8 = 30 5/6 + 41 7/12
X - 24 5/8 = 30 10/12 + 41 7/12
X - 24 5/8 = 71 17/12
X - 24 5/8 = 72 5/12
X = 72 5/12 + 24 5/8 =
x= 72 10/24 + 24 15/24
x= 96 25/24
x = 97 1/24
X - 49 7/12 = 51 15/18 + 10 1/18
X-49 7/12 = 61 16/18
X - 49 7/12 = 61 8/9
x= 61 8/9 + 49 7/12
x = 61 32/36 +49 21/36
X = 110 53/36
x = 111 17/36
X-92 3/10 = 8 19/20 + 4 2/15
X-92 3/10 = 8 57/60 + 4 8/60
X-92 3/10 = 12 65/60
X-92 3/10 = 13 5/60
X-92 3/10 = 13 1/12
x= 13 1/12 + 92 3/10
x= 13 5/60 + 92 18/60
x= 105 23/60
X - 44 13/15 = 44 1/21 + 50 2/35
X - 44 13/15 = 44 5/105 + 50 6/105 =
X - 44 13/15 = 94 11/105
x = 94 11/105 + 44 13/15
x= 94 11/105 + 44 91/105
x= 138 102/105
x = 138 34/35