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0,4x - 1 intreg 2 cincimi = -2,44

Răspuns :

4/10-1 2/5=-244/100 prin amplificare cu10 la 4/10 ,cu20 la 7/5(1 2/5) egal cu 40/100-140/100=244/100.; -100/100=244/100 ; -1=244/100; -1=2,44; adica -2,⁴4 este adevarat