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a fost răspuns

Urgentt pentru maine .
1. Calculati : / = SUPRA
a) - ( 3/5 ) - ( - 4/5 ) = ; b) 1/3 - (+ 1/6 )=
c) 5 la 1/3 - (+2) = ; d) - 4,2 - (- 2 la 1/5 ) =
e) 1,(6) - ( - 5/6 )= ; f) ( - 7/18 ) - ( - 5/12 ) ==
2.Calculati : / = SUPRA
a) ( -3/10) - ( - 5/12) - ( +7/26) =
b) 1/14 - ( 5/28 - 1/84 )=
c) - 3/14 + 9/28 - 5/42 + 1/84 =
d) 1,1(6) - 0,5 + 1,25 - 0,(6) - 2,25 =

3. Calculati : / = SUPRA
123123 / 321321 + 456456 / 654654 - 123123123 / 321321321 - 456456456 / 654654654=
REZOLVARI COMPLETE :* !

Răspuns :

a) - ( 3/5 ) - ( - 4/5 ) = -3/5+4/5=1/5

 b) 1/3 - (+ 1/6 )=(2-1)/6=1/6

c) 5 la 1/3 - (+2) =16/3-2=(16-6)/3=10/3

 d) - 4,2 - (- 2 la 1/5 ) =-42/10+11/5=(-42+22)/10=-20/10=-2

e) 1,(6) - ( - 5/6 )=(16-1)/9+5/6=15/9+5/6=5/3+5/6=(10+5)/6=15/6=5/2

 f) ( - 7/18 ) - ( - 5/12 ) =-7/18+5/12=(-14+15)/36=1/36

2.
a) ( -3/10) - ( - 5/12) - ( +7/26) =-3/10+5/12-7/26=(-3x78+5x65-7x65)/780=
= (-234+325-455)/780=-364/780=-182/390=-91/195

b) 1/14 - ( 5/28 - 1/84 )=(1x6-5x3+1)/84=10/84=5/24

c) - 3/14 + 9/28 - 5/42 + 1/84 =(-3x6+9x3-5x2+1)/84=(-18+27-10+1)/84=0

d) 1,1(6) - 0,5 + 1,25 - 0,(6) - 2,25 =(116-11)/90-5/10+125/100-6/9=105/90-1/2+25/50-2/3=7/6-1/2+1/2-2/3=7/6-2/3=(7-6)/6=1/6

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