6.7*3.6+3.6*3.3 和9.8*25的简便计算
问题描述：
6.7*3.6+3.6*3.3 和9.8*25的简便计算
答
6.7*3.6+3.6*3.3
=(6.7+3.3)×3.6
=10×3.6
=36
9.8*25
=4.9×（2×25）
=4.9×50
=245