ini gimnainaaano 910

9) dasarnya a² - b² = (a - b)(a + b)
a) 6999² - 3001² = (6999-3001)(6999+3001)
= (3998)(10.000)
= 39.980.000
b) 9998² - 2² = (9998-2)(9998+2)
= (9996)(10.000)
= 99.960.000
silahkan lanjutkan sendiri sisa nya
10)
A) 12x²y² + 9xy² / 3xy + 3xy²
= 3xy(4xy+3y) / 3xy(1 + y)
= (4xy + 3y) / (1 + y)
B) 3x²-x-10 / x²+15x-34
= (3x+5)(x-2) / (x+17)(x-2)
= (3x + 5) / (x + 17)
C) x²-81 / x²-20x+99
= (x-9)(x+9) / (x-9)(x-11)
= (x + 9) / (x + 11)
D) 2x²-7x-15 / 4x²-4x-15
= (2x+3)(x-5) / (2x+3)(2x-5)
= (x - 5) / (2x - 5)

 9.  a.) 6999² - 3001² = 48.986.001 - 9.006.001 = 39.980.000
10. c.) x²-81/x²-20x+99 = (x-9)(x+9)/(x-9)(x-11) = x+9/x-11
Maaf kalau salah :)