Sagot :
Bonsoir
En 2007, il reste 4/4 -1/4 = 3/4
En 2008, il vend 4/5 de 3/4 = 12/20
Il a vendu en tout : 1/4 + 12/20 = 5/20 + 12/20 = 17/20
3) reste invendu 20/20 - 17/20 = 3/20
3/20 = 6 ha
donc 5/20 = 5/20 x 6/3/20 = 30/20 : 3/20 = 600 : 60 = 10 ha
12/20 = 12/20 x 6 /3/20 = 72/20 : 3/20 = 72/3 = 24 ha
superficie = 24 + 10 +6 = 40 ha
2007: il reste 4/4 -1/4 = 3/4 2008: il vend 4/5 de 3/4 = 12/20
Il vend en tout : 1/4 + 12/20 = 5/20 + 12/20 = 17/20
3) invendu 20/20 - 17/20 = 3/20
3/20 = 6 hectares
donc 5/20 = 5/20 x 6/3/20 = 30/20 : 3/20 = 600 : 60 = 10 hectares
12/20 = 12/20 x 6 /3/20 = 72/20 : 3/20 = 72/3 = 24 hectares
la superficie = 24 + 10 +6 = 40 hectares