Question

Oblicz:

a) 3/4 + 2/3 : (-8/12)=

c) (1/3+ 2/7) : (1-1/9) + 3/7=

e) [( - 2/3)² : 8/9]-¹

dam naj

Answer 1

a)

3/4 + 2/3 : (-8/12)=

3/4+2/3*(-12/8)=

3/4-1=

3/4-4/4=

-1/4

 

c)

(1/3+ 2/7) : (1-1/9) + 3/7=

(7/21-6/21)/(8/9)+3/7=

1/21*9/8+3/7=

9/168+3/7=

9/168+72/168=

81/168=

27/56

 

e)

[( - 2/3)² : 8/9]-¹=

((4/9)*9/8))⁻¹=

(1/2)⁻¹=2