9/5×25%+1/4×2.2-0.25用简便方法怎么算?

问题描述:

9/5×25%+1/4×2.2-0.25用简便方法怎么算?

=1.8×0.25+0.25×2.2-0.25×1
=0.25×(1.8+2.2-1)
=0.25×3
=0.75