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afla nr necunoscut: x+7=36, x-9=83,x+(13-8)=74,a-(14-6)=64,34-x=8, 82-x=9,

Răspuns :

x+7=36
x=36-7
x=29

x-9=83
x=83+9
x=92

x+(13-8)=74
x+5=74
x=74-5
x=69

a-(14-6)=64
a-8=64
a=64+8
a=72

34-x=8
x=34-8
x=26

82-x=9
x=82-9
x=73


Succes!!
x-9=83
x=83+9
x=92

x+(13-8)=74
x+5=74
x=74-5
x=69

a-(14-6)=64
a-8=64
a=64-8
a=56

34-x=8
x=34-8
x=26

82-x=9
x=82-9
x=73