Un tractor a arat
in prima zi : 10,8 hectare
in a doua zi :de 4 ori mai putin ca in prima zi
in a treia zi :cu1,08 hectare mai putin ca in a doua zi
in a patra zi :de 4 ori mai mult ca in a treia zi
Ce suprafata totala a arat in cele 4 zile?

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Răspunsuri

2014-04-28T15:50:26+03:00
I zi=10.8 hectare=108000m²
a-II-a zi=108000m²·4=432000m²
a-III-a zi=432000m²-1.08hectare=432000m²-10800m²=421200m²
a-IV-a zi=421200m²·4=1684800m²
108000m²+432000m²+421200m²+1684800m²=2646000m²=264.6 hectare
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