Tính A=1024:2⁴ + 140:(38+2⁵)-7²³ : 7²¹

Tính
A=1024:2⁴ + 140:(38+2⁵)-7²³ : 7²¹
B=(2¹⁷+15⁴).(3¹⁹-2¹⁷).(2⁴-4²)
C=100+98+96+...+4+2-97-95-...-3-1
D=160-(2³.5²-6.25)