______ $\cdot 6=72\backslash cdot\backslash \; 6=72$

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$\mathrm{2,7}+\mathrm{1,6}=2\{,\}7+1\{,\}6=$ ______

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______ $-(9+4)=17-(9+4)=17$

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${\displaystyle \frac{1}{2}:2{=}_{}}\backslash displaystyle\backslash frac\{1\}\{\backslash \; 2\}:2=\_\{\; \}$______

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