二点五乘零点六减一点八乘零点五怎么列脱式

Question

二点五乘零点六减一点八乘零点五怎么列脱式

Answer 1

2.5x0.6-1.8x0.5
=2.5x0.6-0.6x3x0.5
=0.6x2.5-0.6x1.5
=0.6x(2.5-1.5)
=0.6x1
=0.6