Question

calculati, respectand ordinea efectuarii operatiilor : a) [46+2•(48-3•15)]•[72-2•(5•6-7)]
b)
{20+[5•(504:3:2)-20]:40}-15

Answer 1

a)
[46+2•(48-3•15)]•[72-2•(5•6-7)]=
[46+2•(48-45)]•[72-2•(30-7)]=
(46+2•3)•(72-2•23)=
(46+6)•(72-46)=
52•26=
1 352


b)
{20+[5•(504:3:2)-20]:40}-15=
{20+[5•(168:2)-20]:40}-15=
[20+(5•84-20):40]-15=
[20+(420-20):40]-15=
(20+400:40)-15=
(20+10)-15=
30-15=
15

Answer 2

a) [48•(45•15)]•[70•23]=[48•675] • 1610 = 32400•1610 = 52164000 b) {20+[5•(84)-20]:40}-15= {20+400:40}-15= 30 -15= 15