ПОМОГИТЕ ОЧЕНЬ СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ДАЮ 60балов!!!!!!!

Question

ПОМОГИТЕ ОЧЕНЬ СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ДАЮ 60балов!!!!!!!

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Answer 1

127*48-31*87-31*40+127*83=127*(48+83)-31*(87+40)=127*131-31*127=
=127*(131-31)=127*100=12700.

5xy-20x-4y+16=5x*(y-4)-4*(y-4)=(y-4)*(5x-4).

y²+9x+18=0   D=9
x₁=-3      x₂=-6.