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Efectueaza.81:9•6=,,63:9•7=,,,64:8•5=,,,40:8•9=,,24:8+49=,,,90:9-10=,,

Răspuns :

81:9*6=9*6=54
64:8*5=8*5=40
40:8*9=5*9=45
24:8+49 =3+49=52