题目内容
计算:
(1)(-81)-(-29)
(2)5+(-14)+(-6)-(-7)
(3)|-2|+|3.2|-|-2.5|
(4)(+
)-(-
)-(+
)
(5)(+4.85)+(-3.25)
(6)(-2.7)-(+2.3)
(7)(-36.35)+(-7.25)+26.35+(+7
)+10
(8)2
+(-2
)+(-1
)+4
+(-1)+(-3
)
(1)(-81)-(-29)
(2)5+(-14)+(-6)-(-7)
(3)|-2|+|3.2|-|-2.5|
(4)(+
1 |
2 |
1 |
3 |
1 |
4 |
(5)(+4.85)+(-3.25)
(6)(-2.7)-(+2.3)
(7)(-36.35)+(-7.25)+26.35+(+7
1 |
4 |
(8)2
2 |
5 |
7 |
8 |
5 |
12 |
3 |
5 |
7 |
12 |
(1)原式=-81+29=-(81-29)=-52;
(2)原式=5-14-6+7=12-20=-8;
(3)原式=2+3.2-2.5=2.7;
(4)原式=
+
-
=
;
(5)原式=1.6;
(6)原式=-2.7-2.3=-5;
(7)原式=(-36.35+26.35+10)+(-7.25+7.25)=0;
(8)原式=(2
+4
)+(-1
-3
)-1-2
=7-5-1-2
=-1
.
(2)原式=5-14-6+7=12-20=-8;
(3)原式=2+3.2-2.5=2.7;
(4)原式=
1 |
2 |
1 |
3 |
1 |
4 |
7 |
12 |
(5)原式=1.6;
(6)原式=-2.7-2.3=-5;
(7)原式=(-36.35+26.35+10)+(-7.25+7.25)=0;
(8)原式=(2
2 |
5 |
3 |
5 |
5 |
12 |
7 |
12 |
7 |
8 |
7 |
8 |
7 |
8 |
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