Question

pf me ajudem n estou conseguindo nada posso ate repetir estou desesperada

Answer 1

d)13+2×[-7-5×(-9+4)]=
13+2×[-7-5×(-5)]=
13+2×[-7-(-25)]=
13+2×[-7+25]=
13+2×[18]=
13+2×18=
13+36=
49

e)-20-5×[(-2)×(4-7)+8-2×5]=
-20-5×[(-2)×(-3)+8-2×5]=
-20-5×[6+8-2×5]=
-20-5×[14-2×5]=
-20-5×[14-10]=
-20-5×[4]=
-20-5×4=
-20-20=
-40

f)-20-6÷[(-1)×(10-3×7)+8-5×4]=
-20-6÷[(-1)×(10-21)+8-5×4]=
-20-6÷[(-1)×(-11)+8-5×4]=
-20-6÷[11+8-5×4]=
-20-6÷[19-5×4]=
-20-6÷[19-20]=
-20-6÷[-1]=
-20-[-6]=
-20+6=
-14

Espero ter ajudado