Explications étape par étape:
1)Calculer
(‐8)×16= 16×(‐5)= ‐80
=16×(‐3)=48
=-128
(‐4)×(‐6,5)= ‐4×(‐6)= 24
=(‐4)×(‐0,5)=2
=26
6×(‐15)= 6×(‐10)= ‐60
=6×(‐5)= ‐30
=‐90
(‐7)×(‐12)= ‐7×(‐10)=70
= ‐7×(‐2)=14
=84
2) Calculer
A= 8‐8×5= ‐32
B= 9×4+4= 40
C= 4×5×3‐ 6+2×3= 4×5×3=60
= 60+3×2= 66
=66‐6=60
D=7×3×(‐5)+2×(‐11)×4=7×3×(‐5)=-105
=2×(‐11)×4= -88
105+88=‐193
3(Calculer
E=13+[‐5×(1‐17)+3]×(‐3)=13+[‐5×(‐16)+3]×(‐3)
=13+(80+3)×(‐3)
= 13+(‐249)
= ‐236
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Explications étape par étape:
1)Calculer
(‐8)×16= 16×(‐5)= ‐80
=16×(‐3)=48
=-128
(‐4)×(‐6,5)= ‐4×(‐6)= 24
=(‐4)×(‐0,5)=2
=26
6×(‐15)= 6×(‐10)= ‐60
=6×(‐5)= ‐30
=‐90
(‐7)×(‐12)= ‐7×(‐10)=70
= ‐7×(‐2)=14
=84
2) Calculer
A= 8‐8×5= ‐32
B= 9×4+4= 40
C= 4×5×3‐ 6+2×3= 4×5×3=60
= 60+3×2= 66
=66‐6=60
D=7×3×(‐5)+2×(‐11)×4=7×3×(‐5)=-105
=2×(‐11)×4= -88
105+88=‐193
3(Calculer
E=13+[‐5×(1‐17)+3]×(‐3)=13+[‐5×(‐16)+3]×(‐3)
=13+(80+3)×(‐3)
= 13+(‐249)
= ‐236
b,(-4)x(-6,5)=-26
c,(-7)x(-12)=-84
2)A=8-8x5 B=-9x4+4.
A=-8x5+8. B=-36+4
A=-40+8. B=-40
A=-48
C=-4x5x3-6+2x3
C=-20x3-6+2x3
C=-60-6+2x3
C=-66+2x3
C=6-66
C=-60
D=-7x3x(-5)+2x(-11)x4
D=-21x(-5)+2x(-11)x4
D=-105+2x(-11)x4
D=-107x(-11)x4
D=-1177x4
D=-4708
3)E=13+[-5x(1-17)+3]x(-3)
E=13+[-5x(-16)+3]x(-3)
E=13+[-80+3]x(-3)
E=13+(-83)x3
E=-70x3
E=-210
F=127-[12:(-4)-(1-4x0,5)]:2
F=127-[12:(-4)-1,5]:2
F=127-[-3-1,5]:2
F=127-4,5:2
F=127-2,25
F=124,75