Răspuns:
d) 1000-[409x(6:3)+56:8x5]
1000-(409x2+7x5)
1000-(818+35)
1000-853=147
e)[(35:7+21:7)x7+(3+9:3+27)]x7
[(5+3)x7)+(3+3+27)]x7
[(8x7)+33]x7
(56+33)x7
89x7=623
f)[(24x6 +39x5) - 2] +(2000-300 :30)
[(144+195)-2]+(2000-10)
(339-2)+1990
337+1990=2327
