Question

verificati egalitatile.
A.4/1. 2=10/3
b.3/2/5=2,5/1/3
c.2intregi 1/3/2/9=1,5/1/7
d.55/2,5=7intregi 1/3/0,(3)

Answer 1

a) 4/1.2 = 10/3
4 × 3 = 1.2 × 10
12 = 12 adevarat

b) 3/2/5 = 2,5/1/3
3 / (2/5) = 2,5 / (1/3)
3 × 1/3 = 2,5 × 2/5
1 = 5/5 = 1 adevarat

c) 2 1/ (3/2/9) = 1,5 / (1/7)
2 1 / 3 × 9/2 = 1,5 × 7
2 1/ 27/2 = 10,5
2 2/27 = 10,5
(2 × 27 + 2)/ 27 = 10,5
 56/27 = 10,5 fals

d) 55/2,5=7 1/3/0,(3)
11/0,5 = 7 1 : 3: 3/9 = 7 1:3 x 9/3 = 7 1 : 9 = 7 1/9 = (7 x 9 + 1)/9 = 64/9
11/0,5 = 110/5 = 22 nu este egal cu 64/9