Question

Efectuati: a)12/20×4/6×5/22
b)22/36×1/3×81/11
c)50/26×1/10×2/15
d)3 1/4×1 1/3×1/13

Answer 1

Răspuns:

Explicație pas cu pas:

a)    12 / 20 ×  4/ 6 × 5/22 = ( 2 / 5 ) × ( 5 / 22 ) = 1 / 11

b)    22 / 36  × ( 1 / 3) × ( 81 / 11 ) = 3 /2

= ( 22 / 11 ) ×  81 / (36 × 3)  =

= 2 × 3 / 4=

= 3 / 2 = 1 intreg si 1 / 2

c)    50 / 26 × 1 / 10 × 2 / 15 = 5 × ( 1 / 13 ) × ( 1 / 15 ) = 1 / 39

d)    3 intregi si 1 / 4 = ( 3 × 4 + 1 ) / 4 = 13 / 4

      1 intreg si 1 / 3 = 4/3

= 13 / 4 ×  4/ 3  ×  1 / 13 = 1 / 3

= ( 13 / 13 ) × ( 4 / 4 ) × 1 / 3 =

= 1 × 1 × 1 / 3 =

= 1 / 3  

Answer 2

a )

12 / 20 × 4 / 6 × 5 / 22 =

48 / 120 × 5 / 22 =

240 / 2640 = 1 / 11

b )

22 / 36 × 1 / 3 × 81 / 11 =

22 / 108 × 81 / 11 =

1782 / 1188 = 3 / 2

c )

50 / 26 × 1 / 10 × 2 / 15 =

50 / 260 × 2 / 15 =

100 / 3900 = 1 / 39

d )

3 1 / 4 × 1 1 / 3 × 1 / 13 =

3 × 4 + 1 / 4 × 1 × 3 + 1 / 3 × 1 / 13 =

12 + 1 / 4 × 3 + 1 / 3 × 1 / 13 =

13 / 4 × 4 / 3 × 1 / 13 =

52 / 12 × 1 / 13 =

52 / 156 = 1 / 3