2550÷[510-{270-(20-80+7)}]

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Solution

First do (20-80+7)=-53
Then it becomes
2550÷[510-{270-(-53)}]
that is
2550÷[510-{270+53}]
=2550÷[510-{323}]
=2550÷187
=13.63

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Similar questions

Evaluate : $2550 - [510 - {270 - (90 - ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 80 + 7)}]$

Simplify each of the following:
$2550 - 510 - 270 - (90 - 80 + 70)$

\frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}}

\sqrt{5} = 2.236 and \sqrt{10} = 3.162

\begin{array}{rcl} \frac{15}{\sqrt{10} + \sqrt{20} + \sqrt{40} - \sqrt{5} - \sqrt{80}} & = & \frac{15}{\sqrt{10} + 2 \sqrt{5} + 2 \sqrt{10} - \sqrt{5} - 4 \sqrt{5}} \\ = & \frac{15}{3 \sqrt{10} - 3 \sqrt{5}} = \frac{5}{\sqrt{10} - \sqrt{5}} \end{array}

86 \times 27 = (80 + 6) \times (20 + 7)

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