5 sampai 10 tolong !

no 5 : (A)
[tex] \frac{5}{5 + \sqrt{3} } \: \times \: 5 - \sqrt{3} \: = \: \frac{25 - 5 \sqrt{3} }{22} [/tex]
no 6
x = 500.000
20%*500.000 = 100.000
500.000 + 100.000 = 600.000 (C)

no 7
T - F = 10x - 8x = 2x
2x = 4
x = 2
R = 16 , F = 6 , T = 20
16 + 6 + 20 = 42 (C)

no 8
9000 : 18 = 500
1 : 500 (B)

no 10 : (B)

no 9 : (C)