-1-
-2-
= (301 + 299 ) × (301- 299)
= 600 × 2
= 1200
-------------
(301)^2-(299)^2=(301-299)(301+299)
=2(301+299)
=2×600
(301)^2-(299)^2=1200
------------------------
الفرق بين مربعين =1200
-3-
-4-