A-A+
计算下列各题:(1)(-5)+(-2)+(9)-(-8);(2)-15+(3)-(-15)+
问题详情
计算下列各题:
(1)(-5)+(-2)+(9)-(-8);
(2)-15+(3)-(-15)+(7)-(2)+(-8);
(3)0.85+(0.75)-(2
(4)2-[(-5
(5)1-(-
(6)|5
参考答案
(1)(-5)+(-2)+(+9)-(-8)
=-5-2+9+8
=-7+17
=10;
(2)-15+(+3)-(-15)+(+7)-(+2)+(-8)
=-15+3+15+7-2-8
=-15+15+3+7-2-8
=0+10-10
=0;
(3)0.85+(+0.75)-(+234)+(-1.85)+(+3)
=0.85+0.75-234-1.85+3
=0.85+0.75-2.75-1.85+3
=0.85-1.85+0.75-2.75+3
=-1-2+3
=0;
(4)2-[(-523)-(-13)]
=2-(-523+13)
=2+523-13
=723-13
=713;
(5)1-(-12)+(-13)-34
=1+12-13-34
=1+612-412-912
=1-712
=512;
(6)|5111-3417|+4417-111
=5111-3417+4417-111
=5111-111+4417-3417
=5+1
=6.
考点: