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(-9)x(-7)
=63
B) (-1)×(-41)
1 x 41 -> se quitan los paréntesis
=41
C) 3/3+5/5+13/13-4/2
1+1+1-(3/2)
1+1+1-2
3-2
=1
D.[(-1)×(33)]+66
(-33)+66
-33+66
=33
E. (-54)+108=
-54+108
=54
F) MCD DE 46=2x23
MCD DE 69=3x23
MCD DE 23=23