a) "+"
a) 12cxy
б) 2,7c
(-1/3)x*(-4y)*(-9)*(-c) = -(-(-(-(1/3)x*4y)*9)*c) = 1/3x*4y*9*c = 12cxy
a) -3x*(-0,75c) = 3x*0,75c = 3*3/4*c*x = 9/4cx = 2,25cx
б) (-1,5с)*(-6)*(-0,3) = -1,5с*6*0,3 = -1,5*6*0,3c = 2,7c
a) "+"
B1:a) 12cxy
б) 2,7c
Пошаговое объяснение:А4:(-1/3)x*(-4y)*(-9)*(-c) = -(-(-(-(1/3)x*4y)*9)*c) = 1/3x*4y*9*c = 12cxy
B1:a) -3x*(-0,75c) = 3x*0,75c = 3*3/4*c*x = 9/4cx = 2,25cx
б) (-1,5с)*(-6)*(-0,3) = -1,5с*6*0,3 = -1,5*6*0,3c = 2,7c