Răspuns:
a)31500
b)195
c)1620
a) modificat 3000
Explicație pas cu pas:
a) [(x:3):21:4]:5=25
(x:3):21:4=25*5
(x:3):21:4=25*5
(x:3):21:4=125
(x:3):21=125*4
(x:3):21=500
x:3=500*21
x:3=10500
x=10500*3
x=31500
b)[(x*2):6]:5=13
(x*2):6=13*5
(x*2):6=65
x*2=65*6
x*2=390
x=390:2
x=195
c) [(x:9):8]*7=140
(x:9):8=140:7
(x:9):8=20
x:9=20*8
x:9=160
x=180*9
x=1620
a) modificat {[(x:3):2]:4}:5= 25
[(x:3):2]:4=25*5
[(x:3):2]:4=125
(x:3):2=125*4
(x:3):2=500
x:3=500*2
x:3=1000
x=1000*3
x=3000
