Question

Se log 987 = 2,99, determine:
log 98,7 e log 9,87

Answer 1

log 987=2,99

log 987/10=x
log 987-log 10=x
2,99-1=x
x=1,99


log 987/10²=y
log 987-log10²=y
2,99- 2 log10=y
2,99-2.1=y
2,99-2=y
0,99=y