Question

1°) resolva as expressões numéricas :

a)25-{20+[18-(13+10:2)]}=
b)4+[(55-2.9)-(40:2+6)]-8=
c)48-{28-4.[3. (40:5-3):(17-3.4)}+19=
d)76+[15:[15:(6:2+4:2)+1]-27=
e)680-560:8+64.2+3.6=

pfv me ajudem

Answer 1

Boa noite.

a)
25-{20+[18-(13+10:2)]}=
25-{20+[18-(13+5)]}=
25-{20+[18-18]}=
25-{20+0}=
25-20=
= 5

b)
4+[(55-2.9)-(40:2+6)]-8=
4+[(55-18)-(20+6)]-8=
4+[37-26]-8=
4+11-8=
15-8=
= 7

c)
48-{28-4.[3. (40:5-3):(17-3.4)]}+19=
48-{28-4.[3.(8-3):(17-12)]}+19=
48-{28-4.[3.5:5]}+19=
48-{28-4.3}+19=
48-{28-12}+19=
48-16+19=
32+19=
= 51

d)
76+[15:(6:2+4:2)+1]-27=
76+[15:(3+2)+1]-27=
76+[15:5+1]-27=
76+[3+1]-27=
76+4-27=
80-27=
= 13


e)
680-560:8+64.2+3.6=
680-70+128+18=
610+146=
= 756

espero ter ajudado. ;-)