1 )2 * ( а + 3 * b - 7 * с ) = 2 * а + 2 * 3 * b - 2 * 7 * c = 2 * a + 6 * b - 14 * c 2 ) 0 , 4 * ( 1 , 3 * х - 0 , 6 * у - 1 , 3 ) = 0 . 4 * 1 . 3 * x - 0 . 4 * 0 . 6 * y - 0 . 4 * 1 . 3 = 0 . 52 * x - 0 . 24 * y - 0 . 52 3 ) ( а - 4 * d + 3 * р ) * ( - 0 , 8 ) = - 0 . 8 * a - 0 . 8 * ( - 4 * d ) - 0 . 8 * 3 * p = - 0 . 8 * a + 0 . 8 * 4 * d - 0 . 8 * 3 * p = 0 . 8 * a + 3 . 2 * d - 2 . 4 * p 4 ) - 0 , 4 * а * ( - 4 * b + 3 * p - 1 , 1 * c ) = - 0 . 4 * a * ( - 4 * b ) - 0 . 4 * a * 3 * p - 0 . 4 * a * ( - 1 . 1 * c ) =1 . 6 * a * b - 1 . 2 * a * p+ 0 . 4 * a * c