=9.6+9.9x99 =4.65x32+2.5x46.5+0.465x430
=9.6+(9.9x100)-9.9 =46.5x3.2+46.5x2.5+46.5x4.3
=9.6+990-9.9 =46.5x(3.2+2.5+4.3)
=989.3 =46.5x10
=465