12-1.4*1.6=4*3-1.4*4*0.4=4(3-1.4*0.4)=4*(3-0.56)=4*2.44=9.76
12-1.4X1.6=12-(1.5-1)X(1.5+1)=12-(1.5²-1)=12-2.25+1=10.75
