b) 45 - 5. ( 12 + 9 )
= 45 - 5 . 21
= 45 - 105
= -60
d) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
= 29 . 6 - 19 . 16
= 174 - 304
= -130
f) ( -12 ) .47 + ( -12 ) . 52 + (-12)
= ( -12 ) . [ 47 + 52 + 1 ]
= ( -12 ) .100
= -1200
h) -48 + 48 . (-78 ) + 48 . (-21 )
= 48 . [ -1 + ( -78 ) + ( -21 ) ]
= 48 . ( - 100 )
= -4800
$@yenngoc$