срочно!!! пожалуйста помогите решить.. Created by dna. algebra-ru

672. 1-a - 2 + -3-7a+2a² =1-a+a² (1+a) a³+1a³+1=(a+1)(a²-a+1)=(1+a)(1-a+a²)= (1-a)(1+a)-2(1-a+a²)-3-7a+2a² = 1-a²-2+2a-2a²-3-7a+2a² = -a²-5a-4 = a³+1 a³+1 a³+1= _ a²+5a+4 a³+1673.49x²-71x+22=0D=71²-4*49*22=5041-4312=729=27²x₁=(71-27)/(49*2)=44/98=22/49x₂=(71+27)/98=98/98=1Ответ: 1674.√20 - (√(√5+1) - √(√5-1))²=√20 - (√5 +1-2√(√5+1)(√5-1)+√5 -1)==√20-(2√5 -2√(5-1)) = √20-(2√5 - 4)=√20 - √20 +4=4675.у=-3х+mт.А(-1; 2)2= -3(-1)+m2=3+mm=-1y=-3x-1График функции - прямая. Точки для построения:х | 0 | 2y | -1| -7-3x-1<0-3x<1x>-¹/₃При х> -¹/₃ функция у=-3х-1 <0676.{2x+6y=18 | умножим на "-3" {-6x-18y=-54{3x-5y=-29 | умножим на 2 {6x-10y=-58Складываем уравнения:-18у-10у=-54-58-28у=-112у=42х+6*4=182х=18-242х=-6х=-3Ответ: х=-3 у=4большое спасибопожалуйста помогите решить второй вариант алгебраНовые вопросы в АлгебраСколькими способами можно рассадить 5 мальчиков и 3 девочки на 8 стульях, стоящих в один ряд, чтобы все девочки не сидели рядом. Пожалуйста, помогите…решить.Реши:t(x)=x+2x²+x-20 при х²+х-20≠03×(a-b-c)+5×(a-b)+3c=8×(a-b)Допоможіть будь ласка!Якщо можна з поступовим поясненнямДякую!m+3 n+3 якщо m>n порівняйте числазависимость y от х задана таблицей. Найдите ее область определения и область значения. Определите, является ли эта зависимость функцией. Постройте гра…фик этой зависимостих -4 -1 3 4 -4у -3 -2 1 -2 3найти производную соs²xНадо решить системы уравнений ( не графичным способом)125a⁸b⁴-20a⁶b⁵______________15a⁵b⁴Упростите помогите пжпжпжпжрж((7^2005)+(7^2004)+8)/((7^2004)+1)ПредыдущийСледующийВместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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срочно!!! пожалуйста помогите решить...

dna @dna

August 2022 1 16 Report

срочно!!!
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Answers & Comments

m11m 672.
1-a - 2 + -3-7a+2a² =
1-a+a² (1+a) a³+1

a³+1=(a+1)(a²-a+1)=(1+a)(1-a+a²)

= (1-a)(1+a)-2(1-a+a²)-3-7a+2a² = 1-a²-2+2a-2a²-3-7a+2a² = -a²-5a-4 =
a³+1 a³+1 a³+1
= _ a²+5a+4
a³+1
673.
49x²-71x+22=0
D=71²-4*49*22=5041-4312=729=27²
x₁=(71-27)/(49*2)=44/98=22/49
x₂=(71+27)/98=98/98=1
Ответ: 1
674.
√20 - (√(√5+1) - √(√5-1))²=√20 - (√5 +1-2√(√5+1)(√5-1)+√5 -1)=
=√20-(2√5 -2√(5-1)) = √20-(2√5 - 4)=√20 - √20 +4=4
675.
у=-3х+m
т.А(-1; 2)
2= -3(-1)+m
2=3+m
m=-1
y=-3x-1
График функции - прямая. Точки для построения:
х | 0 | 2
y | -1| -7
-3x-1<0
-3x<1
x>-¹/₃
При х> -¹/₃ функция у=-3х-1 <0
676.
{2x+6y=18 | умножим на "-3" {-6x-18y=-54
{3x-5y=-29 | умножим на 2 {6x-10y=-58
Складываем уравнения:
-18у-10у=-54-58
-28у=-112
у=4
2х+6*4=18
2х=18-24
2х=-6
х=-3
Ответ: х=-3
у=4