Question

СРОЧНО !!!!!! ПОМОГИТЕ !!!!!!!!!

Answer 1

1) x³ - 27y³ + 3x²y - 9xy² = (x³ - 27y³) + (3x²y - 9xy²) =

= (x - 3y)(x² + 3xy + 9y²) + 3xy(x - 3y) = (x - 3y)(x² + 3xy + 9y² + 3xy) =

= (x - 3y)(x² + 6xy + 9y²) = (x - 3y)(x + 3y)²

$2)left { {{frac{x-2}{4}+frac{y-2}{4}=2} atop {frac{x-2}{3}-frac{y-2}{9}=frac{4}{3} }} right.\\left { {{frac{x-2}{4}*4+frac{y-2}{4}*4}=2*4 atop {frac{x-2}{3}*9-frac{y-2}{9}*9=frac{4}{3}*9}} right.\\left { {{x-2+y-2=8} atop {3x-6-y+2=12}} right.\\+left { {{x+y=12} atop {3x-y=16}} right. \-------\4x=28\x=7\y=12-x=12-7=5$

Ответ : (7 ; 5)