计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-16 1 3 +29 1 6
计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-1613+2916;(4)-0.5-(-314)+2.75-712;(5)-(-7)+...
计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-16 1 3 +29 1 6 ;(4) -0.5-(-3 1 4 )+2.75-7 1 2 ;(5)-(-7)+(-2);(6)(-4 1 4 )-(+5 1 3 )-(-4 1 4 );(7)(+9)+(-7)+(+10)+(-3)+(-9);(8)1-3+5-7+9-11+…+97-99+100.
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2014-08-30
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(1)(-23)+(-12)=-35;
(2)6-(+3)-(-7)+(-2)=6-3+7-2=13-5=8;
(3)-16 +29 =12 ;
(4) -0.5-(-3 )+2.75-7 =-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. |
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