Question

Efectuați:
am nevoie urgent​

Answer 1

a)

2 : 2²/3² + 11/5 × 10/11 =

= 2 : 4/9 + 2/1

= 2 × 9/4 + 2

= 9/2 + 2/1

= 9/2 + 4/2

= 13/2

b)

(3/1 - 1/3)² + (2/1 - 1/2)² - (1/1 - 1/2)² =

= (9/3 - 1/3)² + (4/2 - 1/2)² - (2/2 - 1/2)²

= (8/3)² + (3/2)² - (1/2)²

= 8²/3² + 3²/2² - 1²/2²

= 64/9 + 9/4 - 1/4

= 256/36 + 81/36 - 9/36

= 337/36 - 9/36

= 328/36

c)

[( 1/2 + 2/3 + 5/6) : 7/12 - 2/5 • 5/6] • 1/4 : ( 5 • 12/25 - 1 1/3) =

= [( 3/6 + 4/6 + 5/6) : 7/12 - 1/3] • 1/4 : ( 12/5 - 1 • 3 + 1/3)

= [ 12/6 : 7/12 - 1/3 ] • 1/4 : ( 12/5 - 4/3 )

= [ 2 • 12/7 - 1/3] • 1/4 : ( 36/15 - 20/15)

= [24/7 - 1/3] • 1/4 : 16/15

= [ 72/21 - 7/21] • 1/4 : 16/15

= 65/21 • 1/4 : 16/15

= 65/84 • 15/16

= 975/1344

la d nu se vede ultima fractie