Răspuns:
a) 7×(3-9)=7×3-7×9=21-63=-42..l
=7×(-6)=-42
b) -4×(-8+12)=-4×(-8)+(-4)×12=32-48=-16 l
=-4×4=-16
c) (-5)×(-6-(-2))=(-5)×(-6+2)=30-10=20 l
=(-5)×(-6)-(-5)×(-2)=30-10=20 ll
d) (-6)×7+(-6)×9=-42+(-54)=-42-54=-96 l
=-6(7+9)=-6×16=-96 ll
e) (-5)×(+12)+(-5)×7=-60+(-35)=-60-35=-95 l
=(-5)(12×7)=(-5)(12+7)=(-5)(19)=-95 ll
f) (-10)×7-(-10)×9=-70-(-90)=-70+90=20 l
=(-10)(7-9)=-10×(-2)=20 ll
