Question

determinatin numerele naturale x pt care sunt adevarate

a)531-6.x=453


b)14.x-15=13



c)12435.(2.x-8)=0



d) 512÷(x+9)=16

Answer 1

a) 531-6x=453
531-453=6x
78=6x
78:6=x
13=x
531-6×13=453
531-78=453
453=453

b) 14x-15=13
14x=13+15
14x=28
x=28:14
x=2
14×2-15=13
28-15=13
13=13

c) 12 435(2×-8)=0
24 870x-99 480=0
24 870x=99 480
x=99 480:24 870
x=4

d) 12 435(2×4-8)=0
12 435(8-8)=0
12 435×0=0
0=0