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How do you solve number 4? Thanks if you help me.

How do you solve number 4? Thanks if you help me.-example-1
User Nagra
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\bf \cfrac{4^2-20/ 5}{1-5+7}\implies \cfrac{\stackrel{\downarrow }{16}-20/ 5}{1-5+7}\implies \cfrac{16-\stackrel{\downarrow }{4}}{1-5+7}\implies \cfrac{\stackrel{\downarrow }{12}}{1-5+7} \\\\\\ \cfrac{12}{\stackrel{\downarrow }{-4}+7}\implies \cfrac{12}{\stackrel{\downarrow }{3}}\implies 4

User Vanz
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