Calculeaza (0,(3) + 1/4) x (1 + 5/7) - (1/2)la puterea a doua

Răspuns :

= (1/3+1/4)x (7/7 + 5/7) - 1/4
= (4/12+ 3/12 ) x 12/7 - 1/4
= 7/12 x 12/7 -1/4
= 1 - 1/4
= 4/4 - 1/4
= 3/4