Question

Aflaţi numărul natural x din egalităţile: a) 21-2-(7+x: 3) = 1; b) 100-2-(7 + 84:x) = 2; c) [2 (7+x: 3) +9]:5-5=0 d) [(3000-x): 3+74]: 100 = 4​

Answer 1

Răspuns:

Explicație:

a) 21-2-(7+x: 3) = 1;

19-(7+x:3)=1

7+x:3=1+19=20

x:3=20-7=13

x=13x3=39

b) 100-2-(7 + 84:x) = 2;

98-(7+84:x)=2

7+84:x=2+98=100

84:x=100-7=93

x=84:93

c) [2 (7+x: 3) +9]:5-5=0

[2 (7+x: 3) +9]:5=5

[2 (7+x: 3) +9]=5x5=25

2 (7+x: 3) =25-9=16

7+x:3=16:2=8

x:3=8-7=1

x=1x3=3

d) [(3000-x): 3+74]: 100 = 4​

(3000-x): 3+74= 4​x100=400

(3000-x): 3=400-74=326

(3000-x)=326 x 3=978

x=3000-978=2022