Question

va rog sa ma ajutati cu următoarele exerciții !! e urgent + coroana !!! exercițiile 4, 5 și 6 !!
cât mai repede, va rog eu foarte mult !!

Answer 1

4. a) 1 - 1/2 - 1/3 - 1/6 = ( 6 - 3 - 2 -1 )/6 = 0/6 = 0

b) 1/5 - 1/10 + 1/15 = ( 6 -3 + 2)/30 = 5/30 = 1/6

c) ( 1 - 1/3) + ( 2 - 2/3) + ( 2-1/3) + ( 1-2/3) =
= 2/3 + 4/3 + 5/3 + 1/3 = ( 2 + 4+ 5+1)/3 = 12/3 = 4

d) ( 3 1/2 - 1/2) + ( 1 1/3 - 1/3)=
= ( 7/2 - 1/2) + ( 4/3 - 1/3) = 3 + 1 = 4

5. a) 2 1/2 - ( 3/4 - ( 1 - 5/8 )) =
= 5/2 - ( 3/4 - 3/8 ) =
= 5/2 - 3/8 = ( 20 - 3)/8 = 17/8

b) 3 1/4 + ( 1 1/6 - ( 1 - 1/12 )) =
= 13/4 + ( 7/6 - 11/12 ) =
= 13/4 + 1/4 = ( 13 + 1)/4 = 14/4 = 7/2

c) ( 1 1/3 - 1 1/5 ) + ( 2 - ( 1 - 1/15 )) =
= ( 4/3 - 6/5 ) + ( 2 - 14/15 ) =
= 2/15 + 16/15 = ( 2 + 16)/15 = 18/15  = 6/5

d) ( 1 + ( 1-2/3)) - ( 2 1/6 - 1 1/3 )=
= ( 1+1/3) -  ( 13/6 - 4/3 ) =
= 4/3 - 5/6 = ( 8-5)/6 = 3/6 = 1/2

6. a) 7/30 * 6/35 = 1/5 * 1/5 = 1/25

b) 3 1/3 * 1 4/5 = 10/3 * 9/5 = 2*3 = 6

c) 4/7 * 6/5 * 7/8 = 6/5 * 1/2 = 3/5

d) 6 * 7/12 * 4/21 * 9 = 1/2 * 4/3 * 9 = 2*3 = 6 

Answer 2

sper ca te.am ajutat!