（7.2+2.8）x14.5+(17-14.5)x2.8=10x14.5+2.5x4x0.7=145+7=152
=14.5*7.2+(14.5+2.5)*2.8=14.5*(7.2+2.8)+2.5*2.8=145+2.5*2+2.5*0.8=145+5+2=152
