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Afla numarul necunoscut 6+[15-(8:a×7+7)]×5=8:(1×4)+3×3
Dau ce vreți

Răspuns :

Ingrid2005com
6+[15-(8:a x 7+7)]x5=8:(1x4)+3x3
6+[15-(8:a*7+7)]*5=8:4+9
6+[15-(8:a*7+7)]*5=2+9
6+[15-(8:a*7+7)]*5=11
[15-(8:a*7+7)]*5=5 |:5
15=1+(8:a*7+7)
15-1=8:a*7+7
14=8:a*7+7
14-7=8:a*7
7=8:a*7 | :7
1=8:a
1*8=a
a=8

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