1.2×6.6+6.4×2.2=1.2×3×2.2+6.4×2.2=2.2×(3.6+6.4)=2.2×10=22
1.2×6.6＝7.926.4×2.2＝14.08简便方法的话我觉得计算器一按就出来了
