Question

66.6×2.2+33.3×15.6怎么简便？

Answer 1

66.6X2.2+33.3X15.6=66.6x2.2+33.3x （7.8X2）=（2.2+7.8）x66.6=666

Answer 2

66.6×2.2+33.3×15.6
=33.3×2×2.2+33.3×15.6
=33.3×（4.4+15.6）
=33.3×20
=666