Помогите решить а то забыл как надо. Created by turalibragimov. matematika-ru

Помогите решить а то забыл как надо...

July 2022 1 7 Report

Помогите решить а то забыл как надо

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uspspb 862 номер
x+y=5
x^2+y^2=17

выражаем x через первое уравнение
x=5-y

Подставляем во второе уравнение и решаем
(5-y)^2+y^2=17
25-10y+y^2+y^2=17
2y^2-10y+25=17
2y^2-10y+8=0

ищем отсюда дискриминант

D=b^2-4ac
D=100-4*2*8=36

y(1)= (10+6)/4= 16/4=4
y(2)= (10-6)/4= 4/4=1

подставляем y (1 и 2) в первое уравнение и находим X

x+4=5
x=1
или
х+1=5
х=4

378 номер

1) 1/a - 2/b= в-2а/ab
2)b/2a-b * в-2а/ab= - 1/a

1 votes Thanks 1

turalibragimov Спасибо

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