Question

Aflați numărul natural x din egalităţile ​

Answer 1

Răspuns:

Explicație pas cu pas:

a) 21-2(7+x:3)=1
2(7+x:3)= 21-1
2(7+x:3)=20
7+x:3= 20/2

7+x:3= 10
x:3= 10-7
x:3= 3
x= 3*3
x= 9.

b) 100-2(7+84:x)=2
2(7+84:x)= 100-2
2(7+84:x)= 98
7+84:x= 98/2

7+84:x= 49
84:x= 49-7
84:x= 42
x= 84/42
x= 2

c) ((2*(7+x:3)+9):5-5=0
((2*(7+x:3)+9):5= 0+5
((2*(7+x:3)+9):5=5
((2*(7+x:3)+9)= 5*5
((2*(7+x:3)+9)= 25
2*(7+x:3)= 25-9
2*(7+x:3)= 16
7+x:3= 16/2
7+x:3= 8
x:3= 8-7
x:3= 1
x= 1*3
x=3

d) ((3000-x):3+74):100=4

((3000-x):3+74)= 4*100
((3000-x):3+74)= 400
(3000-x):3=400-74
(3000-x):3= 326
3000-x= 326*3
3000-x= 978
x= 3000-978

x= 2022