Question

28. Calculați:
a)-5-(-12)+7-(-10);
c) (8-11)-(7-5);
e) (5-7-9)-(7-9-12);
b) (-3+8).(-9);
d) 8 (-15)-(5-10).(-6);
F)(-2022+2021)-(-2020+2019).

Answer 1

a)-5-(-12)+7-(-10)=-5+12+7+10=34

b) (-3+8).(-9)=5×(-9)=-45

c) (8-11)-(7-5)=(-3)-2=-5

d) 8 (-15)-(5-10).(-6)=-120-(-5)×(-6)=

120-(+30)=90

e) (5-7-9)-(7-9-12)=(-11)-(-15)=

-11+15=4

f)(-2022+2021)-(-2020+2019)=

(-1)-(-1)=-1+1=0