Question

Calculeaza: 4/5·[1/2+1/2·(1/2-1/4)] = [1/5+(1/5-1/4·1/8)·3]·2/3=

Answer 1

4/5×[1/2+1/4-1/8]=[1/5+(1/5-1/32)×3]×2/3 amplificãm pe 1/2 cu 4,pe 1/4 cu 2,pe1/5 cu 32 si pe 1/32 cu 5
4/5×[4/8+2/8-1/8]=[1/5+(32/160-5/160)×3]×2/3
4/5×5/8=[1/5+27/160×3]×2/3
1/2=[1/5+81/160]×2/3 amplificãm pe 1/5 cu 32
1/2=[32/160+81/160]×2/3
1/2=113/160×2/3
1/2=113/80 Fals