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800-[(81:9+48:4):7+20]×[(45:3+54:6):3+20] dau coroana...Va rog scris in jos

Răspuns :

   800-[(81:9+48:4):7+20]×[(45:3+54:6):3+20] = 
= 800-[(9+12):7+20]x[(15+9):3+20] =
= 800-(21:7+20)x(24:3+20) =
= 800-(3+20)x(8+20) =
= 800-23x28 = 
= 800-644 =
= 156