Question

Mohon bantuanya ya pake cara...

Answer 1

15. anggap sisi terpendek adalah x
3/4 = x/9
x = 27/4 = 6 3/4 = 6,75 cm (C)

16. (6a + b) : (4a + 5b)
(6 × 3 + 4) : (4 × 3 + 5 × 4)
(18 + 4) : (12 + 20)
22 : 32
11 : 16 (D)

17. jumlah novel drama = 7/12 × 72 = 42 buku
jumlah novel misteri = 5/12 × 72 = 30 buku

jumlah novel misteri yang harus dibeli lagi supaya perbandingannya 1:1 adalah
42 - 30 = 12 buku (B)

18. (a + b) = 1 ; (a - b) = 5
a + b = 1
a - b = 5
------------ -
2b = -4
b = -2

a + b = 1
a - 2 = 1
a = 3

(a^2 - b^2) : (a^2 + b^2)
(3^2 - (-2)^2) : (3^2 + (-2)^2)
(9 - 4) : (9 + 4)
5 : 13 (B)

19. 2 cm : 80 km
2 cm : 8.000.000 cm
1 : 4.000.000 (C)

20. p/7 = 21/49
p = 21/49 × 7
p = 21/7 = 3 (A)