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Alin2012
a fost răspuns

Rezolvati, in numere naturale, ecuatiile:

a) 5x+7=2x+3 x(x+9)-20 b) 4x+31=2x

c) 9x-13=4 x(2x+1)+x-17 d) 6x+10=213

Răspuns :

CosmoteRo
5x+7=2x+3x+27-20
5x-5x=7-7
0

b).4x+31=2x
4x-2x=-31
2x=-31
x=-31:2=-15,5

c)9x-13=4x+4+x-17
9x-5x=13-13
4x=0
x=0

d).6x+10=213
6x=213-10
6x=203
x=33,8(3)

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