Question

Va rog ex 10 ofer coroana si 10 puncte.

Answer 1

Răspuns:

Explicație pas cu pas:

S = aria suprafetei

In prima zi ara S/4.

Rest S - S/4 = 4S/4 - S/4 = 3S/4

In a doua zi ara 2/5 * 3S/4 = 6S/20 = 3S/10

Rest 3S/4 - 3S/10 = 15S/20 - 6S/20 = 9S/20

A treia zi 1/2 * 9S/20 = 9S/40

Rest 9S/20 - 9S/40 = 18S/40 - 9S/40 = 9S/40

A patra zi 9S/40 = 10 ha

S = 40*10/9 = 400/9 ha = 44.(4) ha

Prima zi 1/4* 400/9 = 100/9 = 11,(1) ha

A doua zi 3/10 * 400/9 = 1200/90 = 120/9 = 40/3 = 13,(3) ha

A treia zi 9/40 * 400/9 = 10 ha

A patra zi  = 10 ha