Question

1.1/4 = n/12 + 2/12.Nilai n adalah.....
a.1
b.2
c.3
d.4

2.5/9 - 1/n = 2/9.Nilai n pada persamaan di samping adalah.....
a.2
b.3
c.5
d.9

3.2/8 + A = 5/8.Nilai A adalah.....
a.3/8
b.7/8
c.8/16
d.7/16

Pakai caranya!!!!
Soalnya hari Senin tanggal 16 Maret 2015 akan dikumpul.

Answer 1

1. 1/4 = n/12 + 2/12
n/12 = 1/4 - 2/12
n/12 = 3/12 - 2/12
n/12 = 1/12
n = 1/12 X 12
n = 12/12
n = 1

2. 5/9 - 1/n = 2/9
-1/n = 2/9-5/9
-1/n = -3/9
n X (-3) = -1 X 9
-3n = -9
n = -9/-3
n = 3

3. 2/8 + A = 5/8.
A = 5/8 - 2/8
A = 3/8

Maaf, kalau salah.

Answer 2

1. 1/4=n/12+2/12
    3/12=n/12+2/12
    3/12-2/12=n/12
    3/12-2/12=1/12
    n=1 (a)

2. 5/9-1/n=2/9
        -1/n=2/9-5/9
        -1/n=-3/9
        -1/n=-1/3
        n=3 (b)

3. 2/8 + A = 5/8
           A = 5/8-2/8
           A = 3/8 (a)