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Dolcanorbert
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Afla necunoscuta. 1+{2x[3+(n-4)x5]:6}x7=8

Răspuns :

MadalinaMadutaa
1+{2*[3+(n-4)*5]:6}*7=8
{2*[3+(n-4)*5]:6}*7=8-1
{2*[3+(n-4)*5]:6}*7=7
{2*[3+(n-4)*5]:6}=7:7
{2*[3+(n-4)*5]:6}=1
2*[3+(n-4)*5]=1*6
2*[3+(n-4)*5]=6
3+(n-4)*5=6:2
3+(n-4)*5=3
3+5n-20=3
5n-17=3
5n=3+17
5n=20
n=20:5
n=4
2x[3+(n-4)x5]:6x7=8-1
2x[3+(n-4)x5]:6=7:7
2x[3+(n-4)x5]=1x6
3+(n-4)x5=6:2
5n-20=3-3
5n=20
n=20:5
n=4


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