Question

calculati in doua moduri:​

Answer 1

a) 3×(5-7)=3×(-2)= -6

sau

3×(5-7)= 3×5-3×7=15-21= -6

b)-3×(-4+9)= -3×5= -15

sau

-3×(-4+9)= -3×(-4)-3×9=12-27= -15

c) (-5)×6+(-5)×10= -30+(-50)= -30-50= -80

sau

(-5)×6+(-5)×10=(-5)(6+10)= -5×16= -80

d) (-6)× [8-(-3)]=(-6)×(8+3)= (-6)×11= -66

sau

(-6)× [8-(-3)]=(-6)×(8+3)= -6×8-6×3= -48-18= -66

e) (+2)×(-4+6)=2×2=4

sau

(+2)×(-4+6)= 2×(-4) + 2×6= -8+12=4

f) (-2)×(+3-8)= -2×(-5)= 10

sau

(-2)×(+3-8)= -2×3-2×(-8)= -6+16=10

g) (-7)×(-1)+(-7)×(-5)= (-7)(-1-5)=(-7)(-6)=42

sau

(-7)×(-1)+(-7)×(-5)= 7+35=42

h) (-8)×[(-6)+(-4)]=(-8)×(-6-4)=(-8)×(-10)=80

sau

(-8)×[(-6)+(-4)]=(-8)×(-6-4)=(-8)×(-6)-8×(-4)=48+32=80