7.2×5.2-24×1.44
=7.2 ×2×2.6-2.4×14.4
=14.4×2.6-2.4×14.4
=14.4×（2.6-2.4）
=14.4×0.2
=2.88
7.2*5.2-24*1.44简便方法=7.2x5.2-7.2x4.8=7.2x（5.2-4.8）=7.2x0.4=2.88
