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a=777;b=999;c=222
a-(c+c+c)=
b-(c+c)=


Răspuns :

a-(c+c+c)
=777-(222+222+222)
=777-(222×3)
=777-666
=111

b-(c+c)
=999-(222+222)
=999-(222×2)
=999-444
=555
777-3×222=777-666=111
999-2×222=999-444=555