Question

AM NEVOIE URGENT VA ROGG

Answer 1

1.a).2,5=25/10=5/2

b).-3,75=-375/100=-15/4

c). -0,12=-12/100=-3/25

d) 0,(3)=3/9=1/3

e). -1,58(3)=-(1583-158)/900=1425/900=57/36

f). 1,0(54)=(1054-10)/990=1044/990=522/495

2).a).0,3+2,85=3,15

b)2,8-1,4=1,4

c). -9/8 : -3/4 = 3/2

d). -2/3  * -2/3 = 4/9

e).orice nr la puterea 0  = 1

4. [0,05 + 18/19(5/12-11/30-7/45)]:0,025 ( numitor comun 180 in paranteza)

[5/100 + 18/19( 75-66-28 toate supra 180)] : 25/1000=

[1/20 + 18/19 * (-19/180)] : 1/40=

(1/20 - 1/10):1/40 = -1/20 : 1/40= -1/20 * 40 =  -2

6). 1+2/7 {[ -5/3 +1/48 : (1/36-1/24)] : 9 intregi si 1/2 - 0,25}   (factor comun 72 in paranteza rotunda)

9 intregi si 1/2 = (9*2+1)/2=19/2

1+2/7 [ -5/3 +1/48 :   ( -1/72): 19/2 - 25/100]

1+ 2/7 [ -5/3 + 1/48 *( -72):19/2 - 1/4]

1+2/7[ ( -5/3 - 3/2):19/2 - 1/4] (factor comun 6 in paranteza)

1+2/7 [(-10-9 totul supra 6) : 19/2 - 1/4]

1+2/7 * [(-19/6) * 2/19 - 1/4]

1+2/7* (-1/3 - 1/4)     (factor comun 12  in p)

1+2/7(-7/12) = 1 - 1/6 = 5/6