1) 1/4+3/5 = 5/20+12/20 = 17/20 (НОК 20)
2) 9/11-2/5 = 45/55 - 22/55 = 23/55 (НОК 55)
3) 13/16 - 9/32 = 26/32 - 9/32 = 17/32 (НОК 32)
4) 3/28+5/14 = 3/28+10/28=13/28 (НОК 28)
5) 14/15-7/10 = 28/30-21/30 = 7/30 (НОК 30)
6) 3/8+1/6 = 9/24+4/24 = 13/24 (НОК 24)
7) 9/25-7/20 = 36/100-35/100 = 1/100 (НОК 100)
8) 37/42 - 17/24 = 148/168-119/168=29/168 (НОК 168)
9) 11/24 - 3/16 = 22/48-9/48 = 13/48 (НОК 48)
10)9/16 - 7/24 = 27/48 - 14/48 = 13/48 (НОК 48)
11) 1/3 - 1/6 +1/4 = 4/12-2/12+3/12 = 5/12 (НОК 12)
12) 2/5+4/15-5/9 = 18/45 + 12/45 - 25/45 = 5/45 = 1/9
Пошаговое объяснение:
b1+b3=15
b2+b4=30
S10=?
b1*(1 - q^n)
S10 =
q - n
b1+b3=15
b2+b4=30
b2=b1*q
b3=b1*q²
b4=b1*q³
b1+b1*q² =15
b1*q + b1*q³=30
b1(1+q²)=15
b1(q+q³)=30
Поделим 2 на 1
b1(q+q³) 30
=
b1(1+q²) 15
q + q³ q (1 + q²)
= 2 = 2
1 + q² 1 + q²
q = 2
b1(1+q²) =15
b1(1+ 2²)=15
5b1 = 15
b1 = 3
3 * (1 - 2^10) 3 * (1 - 1024)
S10 = =
1 - 2 -1
S10 = 3 * 1023 = 3069
S10 = 3069
Пошаговое объяснение:
