Ответ:
-2х-у-6х-7у= -8х-8у=-8(х+у)
1) 47^2 - 3^2 = ( 47 - 3)*( 47 + 3 ) = 44 * 50 = 2200
2) 27^2 + 2*27*13 + 13^2 = ( 27 + 13)^2 = 40^2 = 1600
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3) 2200 : 1600 = 22 : 16 = 1,375 ( ответ )
( 4X - 8)² * ( X - 8 ) = ( 4X - 8) * ( X - 8)²
( 4X - 8) * ( 4X - 8) * ( X - 8 ) = ( 4X -8) * ( X - 8 ) * ( X - 8 )
4X - 8 = X - 8
4X - X = - 8 + 8
3X = 0
X = 0
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Проверка
( - 8)² * ( 0 - 8 ) = ( - 8 ) * ( - 8 )²
( - 8 )³ = ( - 8 )³