X²-9y²+x-3y=(x²-9y²)+(x-3y)=(x²-(3y)²)+(x-3y)=(x-3y)(x+3y)+(x-3y)=
=(x-3y)(x+3y+1)
X^2 + 3 - 3 + x = 0
x^2 + x = 0
x (x + 1) = 0
1) x = 0;
2) x + 1 = 0
x = - 1
Ответ
- 1; 0
Ответ на картинке внизу страницы
b) (94,5^2-30,5^2): ((69^3+29^3):98-69*29)=(94.5+30.5)(94.5-30.5)/(69:2-69*29+29^2-69*29)= 125*64/(69-29)^2=5^3*4^3/40^2=20^3/40^2=8000/1600=5