Question

Calculati in modul cel mai eficient:
4 1/9 x 5/8 + 3 5/9 x 5/8 + 1 1/3 x 5/8

Answer 1

4 1/9 × 5/8 + 3 5/9 × 5/8 + 1 1/3 × 5/8 =

Transformi nr. mixt intr-o fractie supraunitara

= 37/9 × 5/8 + 32/9 × 5/8 + 4/3 × 5/8 =

Simplifici numerele cu 8 

= 37/9 × 5/8 + 4/9 × 5 + 4/3 × 5/8 =

= 37/9 × 5/8 + 4/9 × 5 + 1/3 × 5/2 =

Inmultesti primele fractii

= 185/72 + 4/9 × 5 + 1/3 × 5/2 

Calculezi produsul 

= 185/72 + 20/9 + 5/6 =

Aduci la acelasi numitor = 72

= ( 185 + 160 + 60)/72 = 

= 405/72 

Simplifici fractia cu  9

= 45/8