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4+10x[252+10x(84+84:4-5x6)]=   


Răspuns :

4+10*[252+10*(84+21-30)]
4+10*(252+10*75)
4+10*(252+750)
4+10*(1002)
4+10020 = 10024 (Cred ca e bine :)  )
=4+10x[252+10x(84+21-30)]
=4+10x(252+10x75)
=4+10x1002
=4+10020=10024