计算:(1)(-23)+(-12);(2)6-(+3)-(-7)+(-2);(3)-1613+2916;(4)?0.5?(?314)+2.75?71
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)-1613+2916;(4)?0.5?(?314)+2.75?712;(5)-(-7)+(-2);(6)(-414)-(+513)-(-414);(7)(+9)+(-7)+(+10)+(-3)+(-9);(8)1-3+5-7+9-11+…+97-99+100.
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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.
(2)6-(+3)-(-7)+(-2)=6-3+7-2=13-5=8;
(3)-16
1 |
3 |
1 |
6 |
5 |
6 |
(4)?0.5?(?3
1 |
4 |
1 |
2 |
(5)-(-7)+(-2)=7-2=5;
(6)(-4
1 |
4 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
4 |
1 |
3 |
1 |
3 |
(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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