(-0.5)-9/2-(-19/2)+9.75

问题描述:

(-0.5)-9/2-(-19/2)+9.75

(-0.5)-9/2-(-19/2)+9.75
=-0.5+9.75-9/2+19/2
=9.25+(19/2-9/2)
=9.25+5
=14.25