小学五年级奥数（简便计算）

4.7×2.8+3.6×9.4
=4.7×2.8+3.6×2×4.7
=4.7×（2.8+7.2）
=4.7×10
=47
0.525÷13.125÷4×85.2
=0.525÷（13.125×4）×85.2
=0.525÷52.5×85.2
=0.01×85.2
=0.852