Vi prego aiutatemi con queste espressioni x domani!!!!!!

[franainmatematica]

Espressioni con numeri razionali!!
[(-14/3)x(2/5-3/7)+(5/6-2/3): (-5/2)]x{[(-3+1/2)x(-1/2)]:[1/2-(2/3+1/6)]}=
deve dare -1/4 e poi
{[(1/3+1/6): (3/2-1)]: (2-5/2+1/3)}x[(5/8-3/2)x(-8/9)+(-4/3-1/2): (5/6-1+5/3)]=
deve dare 8/3

Grazie!!

[Ali Q]

Ecco a te:

PRIMO ESERCIZIO:

[(-14/3)x(2/5-3/7)+(5/6-2/3): (-5/2)]x{[(-3+1/2)x(-1/2)]:[1/2-(2/3+1/6)]}=

[(-14/3)x(14/35-15/35)+(5/6-4/6): (-5/2)]x{[(-6/2+1/2)x(-1/2)]:[1/2-(4/6+1/6)]}=

[(-14/3)x(-1/35)+ 1/6: (-5/2)]x{[(-5/2)x(-1/2)]: (1/2-5/6)}=

[2/15 + 1/6 x (-2/5)]x [5/4: (3/6-5/6)}=

(2/15 - 1/15)x [5/4: (-2/6)]=

1/15 x [5/4x (-6/2)]=

1/15 x (-15/4)= -1/4


SECONDO ESERCIZIO:

{[(1/3+1/6): (3/2-1)]: (2-5/2+1/3)}x[(5/8-3/2)x(-8/9)+(-4/3-1/2): (5/6-1+5/3)]=

{[(2/6+1/6): (3/2-2/2)]: (12/6-15/6+2/6)}x[(5/8-12/8 )x(-8/9)+(-8/6-3/6): (5/6-6/6+10/6)]=

[(3/6: 1/2) : (-1/6)]x[(-7/8 )x(-8/9)+(-11/6): 9/6]=

[(3/6 x 2) : (-1/6)]x[(-7/8 )x(-8/9)+(-11/6)x 6/9]=

[1 : (-1/6)]x[(7/9)+(-11/9)]=

[1 x (-6)]x(-4/9)=

(-6)x(-4/9)= 8/3

Ciao!!!