25×1/4+0.25×16-1/4= 25×1/4+1/4×16-1/4=(25+16-1)×1/4=40×1/4=10
25×1/4+0.25×16-1/4=(25-1)×1/4+0.25×4×4=24×1/4+1×4=6+4=10
25×1/4+0.25×16-1/4=1/4(25+16-1)=1/4*40=10
0.25*(25+16-1)=10