Question

20. Determinati numarul natural x care verifica egalitatile:

a) x + 89 = 155 ; x =
b) 2 * x + 23 = 91;
c) 327 - 3 * x = 15 + 48;
d) 15 + (x + 2) + 21 = 47
e) 2 * x + 37 = 79 - 14;
f) 32 + (2 * x - 5) = 63 + 14

21. Determinati numarul natural x, care verifica urmatoarele egalitati:

a) 1453 - x = 783;
b) x - 633 = 2941;
c) x - 67 - 92 = 267;
d) 542 + x - 117 = 638;
e) (43 + x) + (537 -214) = 975;

22. Determinati numarul natural necunoscut x, din fiecare inegalitate de mai jos:

a) 19 + x ≤ 43;
b) 28 - x ≥ 11;
c) x + 38 - 18 < 83
d) 41 + x - 39 < 83 - 77

Answer 1

20.

a)

x=155-89=66

b)

2x=91-23

2x=68

x=34

c)

3x=327-15-48

3x=264

x=88

d)

x+2=47-21-15

x=11-2

x=9

e)

2x=79-14-37

2x=28

x=14

f)

2x-5=63+14-32

2x=45+5

2x=50

x=25