prima:
0,1 = 1/10
2,1(3) = 213 - 21 / 90 => 192/90
1/5 * 37/6 = 37/30
1/10 + 192/90 - 37/30 = 90/90 =1
a doua:
[(5√2 - 9√2) * (-4√2)] * (1/√96)=
-4√2 * (-4√2) * (1/4√6) =
16√2 / 4√6 = 4√2/√6=4√3/3
sper ca le am facut bine si nu am gresit la ceva calcule