Rezultatul calculului este:
a) 1/3 + 1/3 : 1/2
b)14 x [1/4 + (5/2 - 1 3/4) : 7/8]

DAU COROANA


Răspuns :

a) 1/3 + 1/3 : 1/2=

1/3 + 1/3 ×2=

1/3+2/3=3/3=1

b) 4 x [1/4 + (5/2 - 1 3/4) : 7/8]=

4 x [1/4 + (10/4 - 1 3/4) : 7/8]=

4 x [1/4 + 3/4 × 8/7]=

4 ×(1/4 + 24/28)=

4 ×(7/28 + 24/28)=

4 × 31/28 = 31/7

a ) 1 / 3 + 1 / 3 : 1 / 2 =

= 1 / 3 + 1 / 3 x 2 / 1

= 1 / 3 + 2 / 3

= 3 / 3

= 1

--------------------------------------------------------

b ) 14 x [ 1 / 4 + ( 5 / 2 - 1 3 / 4 ) : 7 / 8 ] =

= 14 x [ 1 / 4 + ( 5 / 2 - 7 / 4 ) : 7 / 8 ]

= 14 x [ 1 / 4 + ( 10 / 4 - 7 / 4 ) : 7 / 8 ]

= 14 x [ 1 / 4 + 3 / 4 : 7 / 8 ]

= 14 x [ 1 / 4 + 3 / 4 x 8 / 7 ]

= 14 x [ 1 / 4 + 6 / 7 ]

= 14 x [ 7 / 28 + 24 / 28 ]

= 14 x 31 / 28

= 31 / 2