tlg d jwb no 4 yg b,d,f ty

b. a-(b) -c
=-2-(3)-(-4)
=-2-3+4
= -5+4
= -1
d. -a-(-b)-(-c)
=2-(-3)-4
=2+3-4
=5-4
= 1
f. -a-(-b)-c
=2-(-3)-(-4)
=2+3+4
=9

maaf kalo salah:)