Question

Efectuati grupand convenabil:
a)-3/10+4/11-7/10+7/11
b)5/9+3/2+0,(4)-1,5
c)-3 intregi si 1/5+2,25-1,2+3,75

Answer 1

a)-3/10+4/11-7/10+7/11 =  -3/10 -7/10 + 4/11 + 7/11 = - 10/10 + 11/11 = -1+1=0

b)5/9+3/2+0,(4)-1,5 = 5/9 + 4/9 + 1,5 - 1,5  = 9/9 = 1  (3/2 = 1,5 ) 

c)-3 intregi si 1/5+2,25-1,2+3,75 = 3,2 - 1,2 + 2,25 + 3,75 = 2 + 6 = 8  

Answer 2

a) = (-3/10-7/10) + (4/11 +7/11) = -10/10 + 11/11 =-1+1= 0

b)  0,(4) =  4/9,  1,5 = 3/2

Ex devine: (5/9 + 4/9)  +(3/2 - 3/2) = 9/9 - 0 = 1

c) [tex]\it - 3\dfrac{1}{5} = -3\dfrac{2}{10} = -3,2 \\\;\\\ \\\;\\ Ex \ \ devine : (-3,2-1,2) + (2,25 + 3, 75) =-4,4+6 = 1,6[/tex]