Question

Determinati nr naturale x stiind ca
A)x+3=5
B)x-7=9
C)4+x=17
D)23-x=5
E)2•x=42
F)x•7=35
G)x÷3=5
H)45÷x=5

Answer 1

x + 3 = 5     x = 5 - 3    x = 2
x - 7 = 9      x = 9 + 7    x = 16
4 + x = 17    x = 17 - 4    x = 13
23 - x = 5    x = 23 - 5      x = 18
2 x X = 42    x = 42 : 2  x = 21
X x 7 = 35     x = 35 : 7    x = 5
x : 3 = 5     x = 3 x 5      x = 15
45 : x = 5     x = 45 : 5      x = 9