a/
-64 + 8.( 77-19 )
= (-64)+8.58
= (-64)+464
= 464-64
= 400
b/
128.(278-302)+278.(302-128)
= 128.(-24)+278.174
= (-3072)+48372
= 48372-3072
= 45300
c/
(-8).7.(-3).(-5)
= [(-8).7].[(-3).(-5)]
= (-56).15
= -840
d/
2.(-7)^2+3.(-4)^3-60
= [2.(-7).(-7)]+[3.(-4).(-4).(-4)]-60
= 98+-192-60
= -154