计算:
(1)(-23)+(-12);
(2)6-(+3)-(-7)+(-2);
(3)-16+29;
(4);
(5)-(-7)+(-2);
(6)(-4)-(+5)-(-4);
(7)(+9)+(-7)+(+10)+(-3)+(-9);
(8)1-3+5-7+9-11+…+97-99+100.
网友回答
解:(1)(-23)+(-12)=-35;
(2)6-(+3)-(-7)+(-2)=6-3+7-2=13-5=8;
(3)-16+29=12;
(4)=-0.5-7.5+3.25+2.75=-8+6=-2;
(5)-(-7)+(-2)=7-2=5;
(6)(-4)-(+5)-(-4)=-4+4-5=-5;
(7)(+9)+(-7)+(+10)+(-3)+(-9)=9-7+10-3-9=0;
(8)1-3+5-7+9-11+…+97-99+100=(1-3)+(5-7)+(9-11)+…+(97-99)+100=-2-2-2-…-2+100=-2×25+100=50.
解析分析:(1)利用有理数的加法求解即可求得