Question

7.
Find the value of the expression:
987 987 987-357 ~ 357 ~ 357
987 x 987 +987 ~ 357 +357 x 357
(A) 530
(B) 735
(C) 630
(D) 525
(E) None of these

Answer 1

Answer:

Explanation:

ans 7

Answer 2

Answer:

Explanation:987×987×987-357×357×357/987×987+987+357×357

Which can be written as_

(987^3)-(987^3)/ (987^2)+987×357+(357^2)

Using a^3-b^3=(a-b)×(a^2+ab+b^2)

(987-357)×((987)^2+987×357+(357)^2))/(987^2)+987×357+(357^2)

=987-357 [ cancelling Nr and Dr ]

=630

Answer-c