2.2×22%+7.8×2.2-4.4的简便计算
问题描述：
2.2×22%+7.8×2.2-4.4的简便计算
答
2.2×22%+7.8×2.2-4.4
=2.2×（22%+7.8-2）
=2.2×6.02
=2.2×6+2.2×0.02
=13.2+0.044
=13.244