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-7-[-3+(-10)-(-2+1)]+5=?

Răspuns :

-7- [ -3 + ( -10 ) - ( -2 + 1 ) ] + 5 =

= -7- [ -3 - 10 - ( -1 ) ] + 5

= -7- [ -3 -10 + 1 ] + 5

= -7- ( -12 ) + 5

= -7 + 12 + 5

= 5 + 5

= 10