Dê o resultado das operações

a) (-9).(+12).(-2)

b)(-7).(-10).(-5)

c)(-7).(-7).(-1).(-5)

d)(-20).(-2).(+6).(+4)

2) Determine o valor das expressões numéricas

a) 31+(-40)÷(+2)

b)-10-20÷(+4)

c)(+30)÷(-6)+(-18)÷(+3)

d)7:(-7)+2.(-6)+11

e)(-36)÷(-4)+3.(-3)

f)35-6.(+6)+(+54)÷(-6)​
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