Question

Calculati:a)(16×12^10-4×12^10):12^11;b)15^2-(14×15+15):15^2; c)10^3×85-10^3×61-3000 d)5^11-(6×5^10-2×5^10)

Answer 1

a)(16×12^10-4×12^10):12^11= 12^10*(16-4): 12^11=12^10*12: 12^11=
=12^11: 12^11=1

b)15^2-(14×15+15):15^2=15^2-15*(14+1):15^2=15^2-15*15: 15^2=15^2-1=
=225-1=224

c)10^3×85-10^3×61-3000 =10^3×85-10^3×61-3*10^3=
=10^3*(85-61-3)=10^3*21=21*1000=21000


d)5^11-(6×5^10-2×5^10)=5^11-5^10*(6-2)=5^11- 5^10*4=5^10*(5-4)=
=5^10*1=5^10