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NatsuDragnev
@NatsuDragnev
July 2021
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Помогите пжл алгебра экспресс подготовка огэ дали вот дз решить помогите. вариант 2 плиззз
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novokuz
Verified answer
№ 1.
S6=(A1+A6)*6/2=(9+19)*6/2=84, где A6=A1+(n-1)*d=9+(6-1)*2=19
№ 2.
b5=b1*q^4=48*(1/2)^4=48*1/16=3
№ 3.
b1=2/3*5^1=10/3
b2=2/3*5^2=2/3*25=50/3
q=b2/b1=50/3 :10/3 = 50/3 * 3/10 =5
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Answers & Comments
Verified answer
№ 1.S6=(A1+A6)*6/2=(9+19)*6/2=84, где A6=A1+(n-1)*d=9+(6-1)*2=19
№ 2.
b5=b1*q^4=48*(1/2)^4=48*1/16=3
№ 3.
b1=2/3*5^1=10/3
b2=2/3*5^2=2/3*25=50/3
q=b2/b1=50/3 :10/3 = 50/3 * 3/10 =5