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a egal (7/2radical din 5 minus radical din 6/0,8(3) ) : radical din 5 / 2

Răspuns :

0,8(3)=(83-8)/90=75/90=15/18=5/6
A=(7/2√5-√(6/1:5/6)}·2/5=
A=(7√5/10-√(6/1·6/5)·2/5
A=(7√5/10-√36/5)·2/5
A=(7√5/10-6/√5)·2/5
A=(7√5/10-6√5/5)·2/5
A=(7√5/10-12√5)/10)·2/5
A=(-5√5/10)·2/5
A=-2√5/10
A=-√5/5