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计算题(1)-8+12-(-16)-|-23|(2)(−2.25)+(−5.1)+14+(−418)+(−910)(3)42×(−23)−(−34)÷(−0.25)(4)(134−78−712)÷(−78)+(−83)(5)412×[−32×(−13)2−0.8]÷(−514).

题目详情
计算题
(1)-8+12-(-16)-|-23|
(2)(−2.25)+(−5.1)+
1
4
+(−4
1
8
)+(−
9
10
)
(3)42×(−
2
3
)−(−
3
4
)÷(−0.25)
(4)(1
3
4
7
8
7
12
)÷(−
7
8
)+(−
8
3
)
(5)4
1
2
×[−3(−
1
3
)2−0.8]÷(−5
1
4
).
▼优质解答
答案和解析
(1)原式=-8+12+16-32
=4+16-32
=20-32
=-12;

(2)原式=(-2.25+
1
4
)+(-5.1-
9
10
)+(-4
1
8

=-2-6-4
1
8

=-8-4
1
8

=-12
1
8


(3)原式=-28-
3
4
×4
=-28-3
=-31;

(4)原式=(
7
4
-
7
8
-
7
12
)×(-
8
7
)+(-
8
3

=
7
4
×(-
8
7
)-
7
8
×(-
8
7
)-
7
12
×(-
8
7
)-
8
3

=-2+1+(
2
3
-
8
3

=-1-2
=-3;

(5)原式=
9
2
×[-9×
1
9
-0.8]÷(-
21
4

=
9
2
×(-
9
5
)×(-
4
21

=-
81
10
×(-
4
21

=
54
35