Объяснение:
2A . 15 . . . . = [( a² + b² - ( a - b )²]/( a² - b²) =( a² + b²- a²+ 2ab- b²)/(a² - b²) =
= 2ab/( a² - b²) .
16 . . . . = [( a - b )²- ( a + b )²]/( a² - b²)] = ( a²- 2ab + b²- a²- 2ab -b²)/(a² - b²) =
= - 4ab/( a² - b²) ;
17 . . . . = ( 4x - 4x + 4y )/( x² - y² ) = 4y/( x² - y² ) ;
18 . . . . = [ 3y² * 3( x - y ) ]/[ ( x² - y² )y ] = 9y/( x + y ) ;
19 . . . . = [ ( x² - y² ) * 2y ]/[ 2xy( x - y ) ] = ( x + y )/x ;
20 . . . . = ( x² - y²)/ y² : ( 7x - 7y )/y = ( x² - y²)/ y² * y/7( x - y ) = ( x + y )/7y .
7у=-3
у=-3:7
у=-3/7
подставляем,находим х
2х-3/7=-1
14х-3=-7
14х=-7+3
14х=-4
х=-4:14
х=-4/14
х=-2/7