Resposta:
OLÁ
A)
[tex]( + 2) \times ( - 10) \\ - (2 \times 10) \\ \boxed{ \blue{ = - 20}}[/tex]
B)
[tex]( + 3) \times ( - 5) \\ - (3 \times 5) \\ \boxed{ \blue{ = - 15}}[/tex]
C)
[tex]( - 5) \times ( + 1) \\ 5 \times 1 \\ \boxed{ \blue{ = - 5}}[/tex]
D)
[tex]( - 1) - ( - 7) \\ - 1 - ( - 7) \\ - 1 + 7 \\ \boxed{ \blue{ = 6}}[/tex]
E)
[tex]0 \times ( - 3) \\ - (0 \times 3) \\ \boxed{ \blue{ = 0}}[/tex]
F)
[tex]( + 12) \times ( - 5) \\ - (12 \times 5) \\ \boxed{ \blue{ = - 60}}[/tex]
G)
[tex]3 \times ( - 15) \\ - (3 \times 15) \\ \boxed{ \blue{ = - 45}}[/tex]
H)
[tex]( + 100) \times ( - 1) \\ - (100 \times 1) \\ \boxed{ \blue{ = - 100}}[/tex]
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espero ter ajudado
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