Exercițiul 5, 7 și 8 repede va rog!!
Răspunsuri la întrebare
5. a) x/29 - 4/29 = 10/29 | × 29
x - 4 = 10 => x = 14
b) 15/41 - x/41 = 9/41 | × 41
15 - x = 9 => x = 6
c) 18/53 - 7/53 = x/53 | × 53
18 - 7 = x => x = 11
d) x/17 - 3/17 = 1 | × 17
x - 3 = 17 => x = 20
7. a) 11/12 - ²) 1/6 = 11/12 - 2/12 = 9/12 (³ = 3/4
b) 5/36 - ⁴) 1/9 = 5/36 - 4/36 = 1/36
c) 19/20 - ⁴) 4/5 = 19/20 - 16/20 = 3/20
d) ²) 5/7 - 3/14 = 10/14 - 3/14 = 7/14 (⁷ = 1/2
e) 20/63 - ⁷) 2/9 = 20/63 - 14/63 = 6/63 (³ = 2/21
f) 11/24 - ²) 5/12 = 11/24 - 10/24 = 1/24
g) 5/18 - ³) 1/6 = 5/18 - 3/18 = 2/18 (² = 1/9
h) ⁴) 1/4 - 3/16 = 4/16 - 3/16 = 1/16
8. a) ⁷) 1 - 4/7 = 7/7 - 4/7 = 3/7
b) ⁸) 1 - 7/8 = 8/8 - 7/8 = 1/8
c) ⁹) 1 - 2/9 = 9/9 - 2/9 = 7/9
d) ⁴) 1 - 3/4 = 4/4 - 3/4 = 1/4
e) ²) 3 - 1/2 = 6/2 - 1/2 = 5/2
f) ⁴) 2 - 3/4 = 8/4 - 3/4 = 5/4
g) ¹⁵) 1 - 4/15 = 15/15 - 4/15 = 11/15
h) ⁷) 1 - 3/7 = 7/7 - 3/7 = 4/7