Question

Doar B și C de la 12 și 13 VA ROG URGENT DAU COROANA ȘI MULTE PUNCTE MULTE

Answer 1

12. b) 12/25 : (4/5:9/35) = 12/25:(4/5*35/9) = 12/25:(4*7/9) = 12/25:28/9 =
= 12/25*9/28 = 3/25*9/7 = 27/175

c) (25/36:7/16):(60/49:162/7) =
= (25/36*16/7):(60/49*7/162) =
= (25/9*4/7):(10/7*1/27) =
= 100/63:10/189 =
= 100/63*189/10 =
= 10*3 =
=30


13. b) ( 11/24+11/36):11/6  / ( 11/6-5/9):23/4 =
= 55/72*6/11   /  23/18*5/23 =
= 5/12 / 1/18*5 =
= 5/12 / 5/18 = 3/2

c) (3 intregi 1/4 + 2 intregi 1/6 ) :0,8(3) / (2 intregi 5/8 -1 intreg 3/4) * 1,(857142) =
= (( 3+2+(1/4+1/6)):83/100  / 21/8 -7/4 =
= (5+5/12)*100/83 / 7/8 = 
=5 intregi 5/12*100/83 / 7/8 = 
= 65/3*25/83 / 7/8 =
= 1625/249 / 7/8  = 13000/1743