Выражение: a) 27-5(2-6b)-14b+9 b) -4(7z-23+4d)-2(d-z) c) 5k-(6k-(2k-3)) d) 7y-(-3y)-8z)

A) 27-5(2-6b)-14b+9= 27-10+30b-14b+9= 26+16b
b) -4(7z-23+4d)-2(d-z)= -28z+92-16d-2d+2z= -26z+92-18d
c) 5k-(6k-(2k-3))= 5k-(6k-2k+3)= 5k-6k+2k-3= k-3
d) 7y-(4y-((z-3y)-8z)= 7y-(4y-(z-3y-8z))= 7y-(4y-z+3y+8z)= 7y-4y+z-3y-8z= -7z

A) 27-5(2-6b)-14b+9= 27-10+30b-14b+9= 26+16b
b) -4(7z-23+4d)-2(d-z)= -28z+92-16d-2d+2z= -26z+92-18d
c) 5k-(6k-(2k-3))= 5k-(6k-2k+3)= 5k-6k+2k-3= k-3
d) 7y-(4y-((z-3y)-8z)= 7y-(4y-(z-3y-8z))= 7y-(4y-z+3y+8z)= 7y-4y+z-3y-8z= -7z