O TU 13. 2.3 x 2.3 x 2.3-1 - 2.3 x ...
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O TU 13. 2.3 x 2.3 x 2.3-1 - 2.3 x 2.3+ 2.3 + 1 (1) 1.3 (2) 3.3 (3) 0.3 (4) 2.2

11th - 12th Class
Maths
Solution
128
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13. (1) ( frac{(2.3)^{3}-(1)^{3}}{(2.3)^{2}+2.3+1} ) ( =frac{(2.3-1)left[(2.3)^{2}+2.3+1right]}{(2.3)^{2}+2.3+1} ) ( left[because a^{3}-b^{3}=(a-b)left(a^{2}+b^{2}+a bright)right] ) ( =2.3-1=1.3 )
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