प्र.2. - सूत्र (a + b) = a + 3ab + 3ab* + b का उपयोग करके विस्तार कीजिए।
(1) (3x+4y
(2) (52)
प्र.3- सूत्र (a - b) = a - 3ab + 3ab-b' का उपयोग करके विस्तार कीजिए।
(2) (99)
(1) (2m-5)
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