Calculati:a)[(-16)÷(-4)+12÷(-6)]×(-7);b)[54÷(-6)-(-20)÷(-4)]×(-2);​

Răspuns :

Răspuns:

a)

[(-16)÷(-4)+12÷(-6)]×(-7)=

(+4-2)×(-7)=

=(+2)×(-7)

=-14

b)

[54÷(-6)-(-20)÷(-4)]×(-2)=

=[(-9-(-5)]×(-2)

=(-9+5)×(-2)

=-4×(-2)

=+8