Question

Oblicz:

a) 5 1/4: 14 + 7 1/2 *4 / (36 : 21/50 - 75 3/14) :3 =

b) ( 0,76 : 1 1/3 - 0,5) + ( 17/40 - 0,2 :1 3/5) =

c) 2 1/3 - 3,2 / (- 4 1/2) 8 (- 0,4) =

d) 3,6+ 1,8 - 1 1/3 / 2,52 – 2,1 : 9,4 =

e) [(-0,8) 8 (-1,5) - 3,3] : 0,3 =

Answer 1

a)=8 19/28

b)=4/5

c)=-13/216

d)=coś jest nie tak

e)=21

 

Answer 2

Oblicz:

a) 5 1/4: 14 + 7 1/2 *4  / (36 : 21/50 - 75 3/14) :3 =

= (21/4)* (1/4) + (15/2)*4 / [ 36*(50/21) -  (1053/14) ] : 3 =

= 21/16 + 30 /  [  (600/7 - (1053/14)] :3 =

= 21/16 + (480/16 ) / (1200/14 - 1053/14) : 3 =

= (501/16 )/  (147/14) :3 =

= [(501/16)*(14/147) ] :3 =

=  (167/56 )*1/3 =

=163/168

 

b) ( 0,76 : 1 1/3 - 0,5) + ( 17/40 - 0,2 :1 3/5) =

=[ ( 76/100) : 4/3 - 0,5 ] + (17/40 - 1/5 : 8/5) =

= [ (19/25)*(3/4) - 0,5]  + [(17/40 - (1/5)*(5/8)] =

= [( 0,57 - 0,5 ]  + [( 17/40) -  1/8] =

= ( 0,07 ) + ( 17/40  - 5/40 ) =

= 0,07 + 12/40 =

= 0,07 + 3/10 =\

= 0,07 + 0,3 =

= 0,37

 

c) 2 1/3 - 3,2  /  ( - 4 1/2) 8 (- 0,4) =

=(7/3) - (16/5)/ ( - 9/2)*8*(-2/5) =

= (35/15 - 48/15)/  (72/5) =

= (-13/15) : (72/5) =

= (- 13/15)* (5/72) =

= - 13/216

 

d) 3,6+ 1,8 - 1 1/3  /  2,52 – 2,1 : 9,4 =

=  5,4 - 4/3 / 2,52 - (21/10)*(10/94)=

= 5,4 -(4/3)*(100/252) =

= 5,4 - 400/756 =

= 54/10 - 100/189 =

= 27/5 - 100/189 =

=  5103/945 - 1000/1890=

= 4103/1890

 

e) [(-0,8) 8 (-1,5) - 3,3] : 0,3 =