(-40)-(+27)+19-24-(-32)变成-40-27+19-24+32之后怎么做?最好从头写到尾.

问题描述:

(-40)-(+27)+19-24-(-32)变成-40-27+19-24+32之后怎么做?最好从头写到尾.

-40-27+19-24+32 =-(40+27+24)+32+19 =51-91 =-40