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Rezolati ecuatiile in multimea numerelor naturale a) 2·x+12=45 b) 4·(4x-15)+3=7 c) 14-3x=5 e) 20-121:x=9 f) 171:x=9

Răspuns :

StefanRa
a) 2*x+12=45/-12
2*x=33/:2
x=16,5

b) 4*(4x-15)+3=7/-3
4*(4x-15)=4/:4
4x-15=1/+15
4x=16/:4
x=4

c)14-3x=5/-14
-3x=-9
3x=9/:3
x=3

e)20-121:x=9/-20
-121:x=-11
121:x=11/*121
x=1331

f)171:x=9/*171
x=1539

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