1) -2a*(-7)*(-5b) 2) -15c*4*(-3d) 3) 7m*(-8)*5n упростите выражение определите коэффициент

1 ) - 2 * a * ( - 7 ) * ( - 5 * b ) = ( - 2 * ( - 7 ) ) * a * ( - 5 * b ) = ( 2 * 7 ) * a * ( - 5 * b ) = 14 * a * ( - 5 * b ) = ( 14 * ( - 5 ) ) * a * ( * b ) = ( - 14 * 5 ) * a * ( * b ) = - ( 10 * 5 + 4 * 5 ) * a * ( * b ) = - ( 50 + 20 ) * a * ( * b ) = - 70 * a * ( * b ) = - 70 * а * b 2 ) - 15 * c * 4 * ( - 3 * d ) = - 15 * 4 * ( - 3 ) c * d = - 60 * ( - 3 ) c * d = 60 * 3 * c * d =180 * c * d 3 ) 7 m * ( - 8 ) * 5 * n = 7 * ( - 8 ) * 5 * m * n = - 56 * 5 * n * m = - ( 50 * 5 + 6 * 5 ) * n * m = - ( 250 + 30 ) * m * n = - 280 * m * n