Question

Calculati:
a)1supra2+5supra7
b)3supra4+6supra11
c)5supra3+4supra9
d)1supra2+1supra3+1supra6
e)2supra5+3supra2+7supra10
f)4supra9+1supra3+7supra18
g)1supra2+1supra3+1supra4+1supra5
h)1supra40+3supra8+7supra4+1supra2
i)1supra9+2supra18+3supra27+4supra 36 
                    va rog sa ma ajutati urgent 

Answer 1

a) 1/2 + 5/7 = ( 1·7)/ 14 + ( 5·2)/ 14 = 7/14 + 10/14 = ( 7 + 10) /14 = 17/14
b) 3/4 + 6/11 = ( 3·11) /44 +( 6·4) /44 = 33/44 + 24/44 = ( 33 + 24) /44 = 57/44
c) 5/3 + 4/9 = ( 5·9) / 27 + ( 4·3)/27 = 45/27 + 12/27 = ( 45 + 12) /27 = 57/27
d) 1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = ( 3 + 2 + 1)/6 = 6/6 = 1
e) 2/6 + 3/2 + 7/10 = ( 2·2)/10 + ( 5·3)/10 + 7/10 =
4/10 + 15/10 + 7/10 = ( 4 + 15 + 7) /10 = 26/10
f) 4/9 + 1/3 + 7/18 = ( 2·4)/18 + ( 6·1)/18 + 7/18 = 8/18 + 6/18 + 7/18 =
   = ( 8 + 6 + 7) /18 = 21/18 = 7/6
g) 1/2 + 1/3 + 1/4 + 1/5 = 30/60 + 20/60 + 15/60 + 12/60 =
     = ( 30+20+15+12)/60 = 77/60
h) 1/40 + 3/8 + 7/4 + 1/2 = 1/40 + 5·3/40 + 10·7/40 + 20·1/40 =
   = 1/40 + 15/40 + 70/40 + 20/40 = ( 1+15+70+20)/40 = 106/40 = 53/20
i) 1/9 + 2/18 + 3/27 + 4/36 = 1/9+1/9+1/9+1/9 = 4/9, se simplifica 2/18 = 1/9, la fel 3/27 = 1/9, 4/36 = 1/9
Sper ca ti-am fost de ajutor!