Răspuns :
A=140ha
A-(3/5)A=?
A-(A-(3/5)A)-?
A-(3/5)A=(5/5)A-(3/5)A=(2/5)A=(2/5)x140ha=(2x140)/5=2x28=56ha ( prima zi )
A-(A-(3/5)A)=A-56ha=140ha-56ha=84ha
A-(3/5)A=?
A-(A-(3/5)A)-?
A-(3/5)A=(5/5)A-(3/5)A=(2/5)A=(2/5)x140ha=(2x140)/5=2x28=56ha ( prima zi )
A-(A-(3/5)A)=A-56ha=140ha-56ha=84ha