Question

50. Aflati x din egalitățile: a) {[(x : 3): 21:4): 5 = 25; b) [(x . 2): 6] : 5 = 13; c) [(x: 9): 8] · 7 = 140.​

Answer 1

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