\frac{3.5 \times3.5-1.9 \times 1.9}{3.5 \times 3.5+1.9 \times 1.9}=?

RRB NTPC 2014 Paper

Question : 83 of 100

Marks: +1, -0

{3.5 ×3.5-1.9 × 1.9}/{3.5 × 3.5+1.9 × 1.9}=?

Solution:

(2)

{3.5 × 3.5-1.9 × 1.9}{3.5 × 3.5+1.9 ×1.9}={3.5^{2}-1.9^{2}}/{3.5^{2}+1.9^{2}}

{12.25-3.61}/{12.25+3.61}={8.64}/{15.86}

={864}/{1586}={432}/{793}

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