Question

Efectuati:
a)-2+3•5
b) -7+4•(-2)
c)-7+(-2)•(-9)
d) 12-(-20)•(-2)

Answer 1

a)-2+3·5=
-2+15=
13

b)-7+4·(-2)=
-7+(-8)=
-15

c)-7+(-2)·(-9)=
-7+18=
11

d)12-(-20)·(-2)=
12-40=
-28

Answer 2

a) - 2 + 3 • 5 =
= - 2 + 15 =
= + 13 =
= 13

b) - 7 + 4 • ( - 2 ) =
= - 7 - 8 =
= - 15

c) - 7 + ( - 2 ) • ( - 9 ) =
= - 7 + ( + 18 ) =
= - 7 + 18 =
= + 11 =
= 11

d) 12 - ( - 20 ) • ( - 2 ) =
= 12 - ( + 40 ) =
= 12 - 40 =
= - 28