Question

70÷√10+√20+√40-√80 if √10=3.16,√5=2.24

Answer 1

$\frac{70}{ \sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{80} } \\ = \frac{70}{ \sqrt{10} + 2 \sqrt{5} + 2 \sqrt{10} - 4 \sqrt{5} } \\ = \frac{70}{(3 \sqrt{10} - 2 \sqrt{5)} } \\ = \frac{70}{3 \times 3.16 - 2 \times 2.24} \\ = \frac{70}{9.48 - 4.48} \\ = \frac{70}{5} \\ = 14 \: \: \: ans$