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279+9x[27+27x(27-9x0)+9]-9-790=

Răspuns :

279+9x[27+27x(27-9x0)+9]-9-790=
= 279+9[27+27x(27-0)+9]-9-790 =
= 279+9(27+27x27+9)-9-790 = 
= 279+9*(27+729+9)-9-790 =
= 279+9*765-9-790=
= 279+6885-9-790=
= 7164-9-790=
=6365