Bonjour,
a)
=57+ 89/1 000= 50+7+8/100+9/1 000
b=
= 458+ 87/100= 00+50+8+8/10+7/100
c=
= 79+541/1 000=70+9+5/10+4/100+1/1 000
d=
= 80+95/1000 =80+9/100+5/1 000
e=
= 120+808/1000 =100+20+8/10+8/1000
21+981/1000
f=
= 21+981/1000 = 20+1+9/10+8/100+1/1 000