2.22×9.9+6.6×6.7=2.22×3.3X3+3.3X2×6.7=6.66X3.3+13.4X3.3=(6.66+13.4)X3.3=20.06 X3.3=66.198
2.22*（100-1）+（6+0.6）*6.7后面自己算
