32×99+32=32×99+32×1=32×（99+1）=32×100=3200
32* 99 + 32 = 32 * 99 + 32 * 1 = 32 * (99 + 1) = 32 * 100 = 3200
32*99+32 =32*(99+1) =32*100 =3200
32X99+32=32X(99+1)=32X100=3200
= 32 × （99+1）
