помогите решить задания по алгебре, необходимо решение. Дам много баллов. Created by aleksiea. algebra-ru

1a)4-1+3=6b)2log(7)16/[log(3)(10-1)*log(7)2]=2*4log(2)7/[log(3)9*log(7)2]=8/log(3)9=8/2=42a)2^x=tt²-3t+2=0t1+t2=3 U t1*t2=2t1=1⇒26x=1⇒x=0t2=2⇒26x=2⇒x=1b)log(20x+6(log(2)x)/2=8log(20x+3log(2)x=84log(2)x=8log(2)x=2x=43a)3^x*(3²-2*3+1)<124*3^x<123^x<3x<1x∈(-∞;1)b)x>0log(0,5)x=tt²+3t-4≤0t1+t2=-3 U t1*t2=-4t1=-4 U t2=1-4≤t≤1{log(0,5)x≥-4⇒x≤16{log(0,5)x≤1⇒x≥1/2x∈[1/2;16]65*6/5*(5/6)^x-9*(5/6)^-x +3=0(5/6)6x=t6t-9/t +3=06t²+3t-9=02t²+t-3=0D=1+24=25t1=(-1-5)/4=-3/2⇒(5/6)^x=-3/2 нет решенияt2=(-1+5)/4=1⇒(5/6)^x=1⇒x=0 Новые вопросы в АлгебраПожалуйста решите уравнение а) а^2+а=0 б) х^2-1=0 в) у^2+9=0^ - степень Он был вдвое старше ее, когда был в ее возрасте. Сумма их возрастов составляет 84 года. Сколько им лет?Подайте у вигляді добутку вираз: m^12+27Найдите сумму x + y,(2x+3y=8(X+2y=5(5,7+12y)+(-4,4y-11x) упростите выражениепомогите с 3,4,5. дам много баловрешите задачу пожалуйстадокажите что для любого натурального числа n справедливо неравенство :1/2^2 + 1/4^2 + 1/6^2 + 1/(2n)^2 + ... < 1/2решите задачу пожалуйстаРешите пожалуйста задачуПредыдущийСледующийВместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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помогите решить задания по алгебре, необходимо решение. Дам много баллов...

aleksiea @aleksiea

July 2022 1 22 Report

помогите решить задания по алгебре, необходимо решение. Дам много баллов

Answers & Comments

sedinalana 1
a)4-1+3=6
b)2log(7)16/[log(3)(10-1)*log(7)2]=2*4log(2)7/[log(3)9*log(7)2]=8/log(3)9=8/2=4
2
a)2^x=t
t²-3t+2=0
t1+t2=3 U t1*t2=2
t1=1⇒26x=1⇒x=0
t2=2⇒26x=2⇒x=1
b)log(20x+6(log(2)x)/2=8
log(20x+3log(2)x=8
4log(2)x=8
log(2)x=2
x=4
3
a)3^x*(3²-2*3+1)<12
4*3^x<12
3^x<3
x<1
x∈(-∞;1)
b)x>0
log(0,5)x=t
t²+3t-4≤0
t1+t2=-3 U t1*t2=-4
t1=-4 U t2=1
-4≤t≤1
{log(0,5)x≥-4⇒x≤16
{log(0,5)x≤1⇒x≥1/2
x∈[1/2;16]
6
5*6/5*(5/6)^x-9*(5/6)^-x +3=0
(5/6)6x=t
6t-9/t +3=0
6t²+3t-9=0
2t²+t-3=0
D=1+24=25
t1=(-1-5)/4=-3/2⇒(5/6)^x=-3/2 нет решения
t2=(-1+5)/4=1⇒(5/6)^x=1⇒x=0

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