Question

6-{[√25-√49)².3²-6.4]:2}

Answer 1

$6-[[(\sqrt{25} -\sqrt{49} )^2*3^2-6*4]:2]$

$6-[[(5-7)^2*9-2]:2]$

$6-[[(-2)^2*9-2]:2]$

$6-[[4*9-2]:2]$

$6-[[36-2]:2]$

$6-[34:2]$

$6-17$

$-11$