Răspuns:
Explicație pas cu pas:
b)
2,5(7) + 3,4(2)
2,5(7) = (257 - 25)/90 = 232/90
3,4(2) = (342 - 34)/90 = 308/90
2,5(7) + 3,4(2) = 232/90 + 308/90 = 540/90 = 6, numar natural
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c)
2,4(3) + 0,3(6)
2,4(3) = (243 - 24)/90 = 219/90
0,3(6) = (36 - 3)/90 = 33/90
219/90 + 33/90 = 252/90
0,04 = 4/100 = 1/25
fractia devine
(252/90) / (1/25) = 252/90 * 25 = 252*25/90 = 70, numar natural
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d)
0,(1) + 0,(2) + ....+ 0,(8) = 1/9 + 2/9 + ....+ 8/9 = 36/9 = 4, numar natural
