👤

Calculeaza folosind factorul comun: a) 7/12*23/27+7/12*4/27 B)17/15*2/34+51/5*2/34

Răspuns :

a) 7/12 * 23/27 + 7/12 * 4/27 = 7/12 (23/27 + 4/27) = 7/12 * 27/27 = 7/12 * 1 = 7/12

b) 17/15 * 2/34 + 51/5 * 2/34 = 2/34 (17/15 + 51/5) = 2/34 (17/15 + 153/15) = 2/34*170/15 = 2/3 
a) 7/12 × 23/27 + 7/12 × 4/27 =

= 7/12·(23/27 + 4/27)

= 7/12 × 27/27

= 7/12

b) 17/15 × 2/34 + 51/5 × 2/34 =

= 2/34·(17/15 + 51/5)

= 2/34 (17/15 + 153/15)

= 2/34 × 170/15

= 2/34 × 34/3

= 2/3