Oi por favor pode resolver essas atividades

a) -{+15-[(-4+20)-20]-17}

b)3.(-4)+(-5).(-6).(-2)+4.(-7)

c)2+{+5.[(6-4:2)²-15]⁴-3}³

d){[5³-2⁴:8-(2-7-4:2)]1}
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