Question

factorise 991×991×991+9×9×9/991×991-991×9+9×9​

Answer 1

Answer:

(991)³ + (9)³/(991)² - 991 × 9 + (9)²

We know that a³ + b³

= (a+b)(a² -ab+b²)

=> a+b= a³+b³/a² - ab + b²

Putting a = 991 and b = 9 we get,

a+b = 991+9 = 1000

Answer 2

Step-by-step explanation:

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