Question

Calculati:
2supra9 +19 supra90+113 supra225

Answer 1

2/9+19/90+113/225
aducem la acelasi numitor, pt.aceasta calculam cmmmc
9=3²
90=2x5x3²
225=5²x3²
[9,90,225]=2x5²x3²=2x25x9=450
450:9=50
450:90=5
450:225=2
deci prima fractie o amplificam cu 50, a doua cu 5 iar a treia cu 2
2/9+19/90+113/225=(50x2+19x5+113x2)/450=(100+95+226)/450=421/450=0,93(5)

Answer 2

trebuie sa le aducem la acelasi numitor, calculam c.m.m.m.c:
9=3²
90=2x5x3²
225=5²x3²
3²x2x5²=9*2*25=450
Acum impartim numitorii la 450:
450:9=50
450:90=5
450:225=2
Apoi prima fractie o amplificam cu 50, a doua cu 5,iar a treia cu 2:
2/9+19/90+113/225=(50x2+19x5+113x2)/450=(100+95+226)/450=421/450=0,93(5)