Question

Efectuati:
trebuie sa aduc la un numitor comun

Answer 1

45=3²×5

9=3²

30=2×5×3

15=3×5

c.m.m.m.c=5¹×2¹×3²=5×2×9=90(numitorul comun)

${}^{ {}^{2)} } \frac{13}{45} + {}^{ {}^{10)} } \frac{4}{9} + {}^{ {}^{3)} } \frac{13}{30} + {}^{ {}^{6)} } \frac{11}{15} \\ \\ = \frac{13 \times 2 + 4 \times 10 + 13 \times 3 + 11 \times 6}{90} \\ \\ = \frac{26 + 40 + 39 + 66}{90} \\ \\ = \frac{171}{90} \\ \\ = \frac{19}{10} \\ \\ = 1.9$