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Rezolvati in multimea numerelor naturale ecuaiile:

a)2x+7=43+x
b)84:(x-3)=12
c)3*(4+5x)=72


Răspuns :

a)2x+7=43+x
2x-x=43-7
x=36
b)84:(x-3)=12
x-3=84:12
x-3=7
x=7+3
x=10
c)3·(4+5x)=72
4+5x=72:3
4+5x=24
5x=24-4
x=20:5
x=4

2x+7=43+x X+7=43 x=43-7 x=36 84:(x-3)=12 x-3=84:12 x-3=7 x=7+3 x=10 3*(4+5x)=72 4+5x=72:3 4+5x=24 5x=24-4 5x=20 x=20:5 x=4