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daca a / b = 0.(4) atunci 2a+3b / 5b este egal cu ...... ( / inseamna fractie )

Răspuns :

Doricutza
a/b=4/9, deci a=4b/9
(2ori4b/9+3b)/5b=(35b/9)/5b=7/9.
a/b=4/9
9a=4b
a=4b/9
inlocuim in relatia
(2a+3b)/5b=(2x4b/9+3b)/5b=[(8b+3bx9)/9]/5b=35b/45b=simplificam=7/9

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