Question

0.45×1.2+1.8÷20分之三有简便计算吗？

Answer 1

0.45×1.2+1.8÷3/20
=0.45x1.2+1.8x20/3
=0.45x1.2+0.6x20
=0.45x1.2+12
=0.45x4x0.3+12
=1.8x0.3+12
=0.54+12
=12.54

Answer 2

0.45×1.2+1.8÷3/20
=0.45×6/5+1.8×20/3
=0.09×6+0.6×20
=0.9×0.6+0.6×20
=0.6×（0.9+20）
=0.6×20.9
=12.54