Plisss banget kakak kakak jawab yang di lingkari Makasih

jawab
(1)
=  7(4)(5) a²b
= 140 a²b

(4)
= 8(3)(-4) (x³y³z²)
= - 96 x³y³z²

(6) 
= (-6)(2)(-4)(-5) (m³x⁴y⁵)
= 240 m³ x⁴ y⁵

(8) 2a(7a² + 4b) =
= 2a(7a²) + 2a(4b)
= 14 a³ + 8 ab

(9) -5p²(6p - 2q) =
= - 5p² (6p) - 5p(-2q)
= - 30p³ + 10 pq

(12) 5m² (2m² + 8 m²n - 5 mn²)
= 5m²(2m²) + 5m²(8m²n) + 5m²(-5mn²)
= 10 m⁴ + 40 m⁴n - 25 m³n²

(13)
a) keliling = 2(p+l)
K = 2 (5x +1 + 3x)
K = 2 (8x + 1)
K = 2(8x) +2(1)
K = 16x + 2

b) K = a+b+c+d
K = (2x) + (4x+1) + (3y)+(2y+4)
K = 2x + 4x + 3y + 2y + 1 + 4
K = 6x + 5y + 5

(14) 
(x+4) (x+5) =
= x(x+5) + 4(x+5)
= x² + 5x + 4x + 25
= x² + 9x + 25

(16)
(4x +3)(5x- 2) =
= 4x(5x -2)  + 3 (5x - 2)
= 20 x² - 8x + 15x - 6
= 20 x² + 7x - 6

(17)
(8 - 5x)(9 - 5x) =
= 8(9- 5x)  - 5x(9 - 5x)
= 72 - 40x - 45x + 25x²
= 72 - 85 x + 25x²