Tolong bantu darurat

9) (6a - 3b + 2c) + ( - 10a + 5b - 8c )
= 6a - 10a - 3b + 5b + 2c - 8c
= - 4a + 2b - 6c ( C )

10) ( 16m + 3n ) - ( 2m - 10n)
= 16m - 2m + 3n + 10n
= 14m + 13n ( A )

11) 2(x + 3y ) - 4(2x - y )
= 2x + 6y - 8x + 4y
= - 6x + 10y ( B )

12) 4p³q² × 6p²r³
= 24p^5q²r³ ( D )

13) ( 2c + 3 )( 2c - 3)
= 4c² + 6c - 6c - 9
= 4c² - 9 ( A )

14) 64p^5q²r⁴
----------------------
16pqr

= ( 16pqr )( 4p⁴qr³ )
-----------------------------
16pqr

= 4p⁴qr³ ( D )


16) 5 + 3(2x + 1) = 3x - 2
5 + 6x + 3 = 3x - 2
6x + 8 = 3x - 2
6x - 3x = - 2 - 8
3x = - 10
x = - 10/3
tdk ad opsi pilihan

18) 2 ( 3x + 2) >_ 4 ( 2x + 5 )
6x + 4 >_ 8x + 20
6x - 8x >_ 20 - 4
- 2x >_ 16
x <_ -8 ( C )

19) K = ( 3x + 2) + ( 5x - 1) + ( x + 12)
40 = 9x + 13
40 - 13 = 9x
27 = 9x
x = 3
sisi 1 = 3x + 2 = 3(3) + 2 = 11
sisi 2 = 5x - 1 = 5(3) - 1 = 14
sisi 3 = x + 12 = 3 + 12 = 15
jadi sisi terpanjang = 15 cm ( D )

9)
6a - 3b + 2c - 10a + 5b - 8c
= -4a + 2b - 6c (C)

10)
16m + 3n - 2m + 10n
= 14m + 13n (A)

11)
2(x + 3y) - 4(2x - y)
= 2x + 6y - 8x + 4y
= -6x + 10y (B)

12)
4p^3 q^2 × 6p^2 r^3
= 24p^5 q^2 r^3 (B)

13)
(2c + 3)(2c - 3)
= 4c^2 - 9 (A)

14)
64p^5 q^2 r^4 : 16pqr
= 4p^4 qr^3 (D)

16)
5 + 3(2x + 1) = 3x - 2
=> 5 + 6x + 3 = 3x - 2
=> 6x + 8 = 3x - 2
=> 6x - 3x = -2 - 8
=> 3x = -10
=> x = -10/3
=> x = -3 1/3 (pilihan tdk ada)

18)
2(3x + 2) _> 4(2x + 5)
=> 6x + 4 _> 8x + 20
=> 6x - 8x _> 20 - 4
=> -2x _> 16
=> x <_ 16/-2
=> x <_ -8 (C)

19)
s1 = (3x + 2) cm
s2 = (5x - 1) cm
s3 = (x + 12) cm
K = 40 cm

K = s1 + s2 + s3
40 = (3x+2) + (5x-1) + (x+12)
40 = 9x + 13
9x = 40 - 13
9x = 27
x = 27/9
x = 3

s1 = (3x + 2) = 3(3)+2 = 9+2 = 11
s2 = (5x - 1) = 5(3)-1 = 15-1 = 14
s3 = (x + 12) = 3+12 = 15

Ukuran sisi yang terpanjang adalah 15 (D)