45 - 5 . (12 + 9)
= 45 - 5 . 21
= 45 - 105
= -60
-48 + 48 . (-78) + 48 . (-21)
= -48 + (-48) . 78 + (-48) . 21
= -48 . (78 + 21 + 1)
= -48 . 100
= -4800
45 - 5 . (12 + 9)
= 45 - 5.21
=9 . 5 + 5 .21
= (9 + 21).5
= 30.5
= 150
-48 + 48 .(-78) + 48.(-21)
= 48.(-1 -78 - 21)
= 48.(-100)
= -4800
k mik nha bn
45-5.(12+9)
=45-5.9+5.12
=45-45+60
=0+60=60
-48+48.(-78)+48.(-21)
= -48+(-48).78+(-48).21
= -48.(78+21+1)
= -48 . 100
= -4800