(7/12-3/16-5/24)+(1/4²)=?

(7/12-3/16-5/24)+(1/4)²=1/41) 7/12-3/16-5/24=28/48-9/48-10/48=9/48=3/162) 1/4·1/4=1/163) 1/16+3/16=4/16=1/4