Question

1)Efectuati :
a)(-34/7)·(-21/17)=
b)12·[1/4+(9/26-2/13):5/13]+(-1/2)

2)Calculati a²+b²/a²-b²= daca:
a) a=√5 si b=√3
b)a=2√3 si b=√7
c) a/b=√5/√7

Answer 1

sper sa te ajute...
.

Answer 2

a))
= -2 x -3= 6
b))
=12[1/4+(9/26 - 4/26):5/13]+(-1/2)
= 12[1/4+5/26 : 5/13 ]+ (-1/2)
= 12[1/4+1/2]+(-1/2)
= 12[1/4+ 2/4]+(-1/2)
= 12x3/4 -1/2
= 9-1/2
= 18/2 -1/2 = 17/2
2)))
a))
5+3/5-3
= 8 /2 = 4
B))
12+7/12-7
= 19/5
C))
5+7/5-7
= 12/-2
= -6