8÷2(2+2)=(8/2)(2+2)=16
https://www.wolframalpha.com/input/?i=8÷2(2%2B2)

a÷b(c+c) =2ac/b = 16 ( a=8,b=2,c=2 )
https://www.wolframalpha.com/input/?i=a%2Fb(c%2Bc),+a%3D8,b%3D2,c%3D2

a÷bc=a/(bc) =1 ( a=8,b=2,c=4)
https://www.wolframalpha.com/input/?i=a÷bc,a%3D8,b%3D2,c%3D4


面白いねw