初一几个很简单的计算题⑴90-(-3);⑵-0.5-(-3 1/4)+2.75-(+ 7 1/2).

问题描述:

初一几个很简单的计算题
⑴90-(-3);
⑵-0.5-(-3 1/4)+2.75-(+ 7 1/2).

⑴90-(-3);
=90+3
=93
⑵-0.5-(-3 1/4)+2.75-(+ 7 1/2).
=-0.5+3.25+2.75-7.5
=-(0.5+7.5)+(3.25+2.75)
=-8+6
=-2