Răspuns:
a.195-6×(30-3×9+27)
195-6×(30-27+27)
195-6×30
195-180=
15
b.5×(4+3×7)-2×{5+2×[10-3×(14-3×4)]}
5×25-2×[5+2×(10-3×2)]
125-2×(5+2×4)
125-2×13
125-26=
99
c.{30+10×[207-6×(28+28÷7)]}÷10-1
[30+10×(207-6×32)]÷10-1
[30+10×(207-192)]÷10-1
(30+10×15)÷10-1
(30+150)÷10-1
180÷10-1
18-1
17
