早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算(1)0-(+52)(2)(−645)−(−1.8)(3)[(-4)-(+8)]-(-5)(4)1+(−112)−(−13)−(+14).

题目详情
计算
(1)0-(+52)
(2)(−6
4
5
)−(−1.8)
(3)[(-4)-(+8)]-(-5)
(4)1+(−1
1
2
)−(−
1
3
)−(+
1
4
).
▼优质解答
答案和解析
(1)0-(+52)
=0+(-52)
=-52;

(2)(−6
4
5
)−(−1.8)
=(-6.8)+1.8
=-(6.8-1.8)
=-5;

(3)[(-4)-(+8)]-(-5)
=[(-4)+(-8)]+5
=-(4+8)+5
=-12+5
=-(12-5)
=-7;

(4)1+(−1
1
2
)−(−
1
3
)−(+
1
4
)
=1+(−1
1
2
)+
1
3
+(−
1
4
)
=(1+
1
3
)+[(-1
1
2
)+(-
1
4
)]
=
4
3
+(-
7
4

=
16
12
+(-
21
12

=-(
21
12
-
16
12

=-
5
12