Respostas
Olá Amigo!!!!
a) 81+ (-20) ×4
=81+(−80)=
= 1
b) (-4) × (-7) -30
=−2
c) -23 - (-6) × (+3)
=−23−(−18)=
=−5
d) (-9)×(+6)-(+2)×(-27)
=−54−(−54)=
=0
e)19-(-4)×(+5)
=19−(−20)=
=39
f)7×(-3)-9×(-6)+11×(-2)
=−21−(−54)+(−22)=
=33+(−22)=
=11
g)(+5)×(+11)-37-(-2)×(+14)
=55−37−(−28)=
=18−(−28)=
=46
h)18-3×(-7) +9×(-4)-20
=18−(−21)+(−36)−20=
=39+(−36)−20=
=3−20=
=−17
Espero ter te ajudado!!!!!
Resposta:
Explicação passo-a-passo:
a)81=(-20)x (=4)
81-80= 1
b)(-4) x (-7) -30
28-30= -2
-2
c)-23- (-6)- (+2)x (-27)
-23+6-2 (27) = 37
-17-2 (-27)= 37
-17 - (54) = 37
-17 + 54 = 37
37
d) -54-2 (-27) =0
-54 -(-54) =0
-54+ 54= 0
0
e)19- (-4) x (+5)
19- (-20) = 39
19+20 =39
39
f)7×(−3)−9×(−6)+11×(−2)
−21−9(−6)+11(−2)=11
−21−(−54)+11(−2)=11
−21+54+11(−2)=11
33+11(−2)=11
33−22=11
11\
g) (+5)×(+11)−37−(−2)×(+14)
55−37−(−2×14)=46
18−(−2×14)=46
18−(−28)=46
18+28=46
46
h) 18−3×(−7)+9×(−4)−20
18−(−21)+9(−4)−20=−17
18+21+9(−4)−20=−17
39+9(−4)−20=−17
39−36−20=−17
3−20=−17
−17