Question

Calculati:
a) (5/6+3/4)*24/19
b) (1/6+7/9)*18/17
c) (5/12-3/18)*4
d) (11/12-7/15)*10/9+1/2

Answer 1

a) (5/6+3/4)*24/19 =(10/12+9/12)×24/19=19/12× 24/19=24/12=2
b) (1/6+7/9)*18/17=(3/18+14/18)× 18/17=17/18× 18/17=1
c) (5/12-3/18)*4= (15/36-6/36)×4=9/36*4=4/4=1
d) (11/12-7/15)*10/9+1/2 =(55/60 -28/60) *10/9+1/2= 27/60 *10/9+1/2=3/6+1/2=
 =1/2+1/2=2/2= 1

Answer 2

a)In paranteza numitorul comun este 12
(5x2+3x3)/12 x 24/19 =
19/12 x 24/19 = 2
b)In paranteza numitorul comun este 18
(1x3+7x2)/18 x 18/17 =
17/18 x 18/17 = 1
c)In paranteza numitorul comun este 36
(5x3-3x2)/36 x 4 =
9/36 x 4 = 1
d)In paranteza numitorul comun este 60
(11x5-7x4)/60 x 10/9 + 1/2 =
27/60 x 10/9 + 1/2 = 
3/6 + 1/2 = 
1/2 + 1/2 = 1