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计算:(1)(-3)+(-9);(2)(-4.7)+3.9;(3)(−312)−514;(4)(−1225)÷(−35);(5)(−3)×56×(−95)×(−14);(6)−2.5÷58×(−14);

题目详情



(−3
1
2
)−5
1
4

(4)(−
12
25
)÷(−
3
5
);
(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
);
(6)−2.5÷
5
8
×(−
1
4
);
1
2
1122
1
4
1144
(−
12
25
)÷(−
3
5
);
(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
);
(6)−2.5÷
5
8
×(−
1
4
);
12
25
12122525
3
5
3355
(−3)×
5
6
×(−
9
5
)×(−
1
4
);
(6)−2.5÷
5
8
×(−
1
4
);
5
6
5566
9
5
9955
1
4
1144
−2.5÷
5
8
×(−
1
4
);
5
8
5588
1
4
1144
▼优质解答
答案和解析
(1)(-3)+(-9)=-3-9=-12;
(2)(-4.7)+3.9=-0.8;
(3)(−3
1
2
)−5
1
4
=−8
3
4

(4)(−
12
25
)÷(−
3
5
)=
12
25
×(−
5
3
)=
4
5

(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
(−3
1
2
111222)−5
1
4
111444=−8
3
4

(4)(−
12
25
)÷(−
3
5
)=
12
25
×(−
5
3
)=
4
5

(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
−8
3
4
333444;
(4)(−
12
25
)÷(−
3
5
)=
12
25
×(−
5
3
)=
4
5

(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
(−
12
25
121212252525)÷(−
3
5
333555)=
12
25
×(−
5
3
)=
4
5

(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
12
25
121212252525×(−
5
3
555333)=
4
5

(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
4
5
444555;
(5)(−3)×
5
6
×(−
9
5
)×(−
1
4
)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
(−3)×
5
6
555666×(−
9
5
999555)×(−
1
4
111444)=-
5
2
×
9
5
×
1
4
=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
5
2
555222×
9
5
999555×
1
4
111444=
9
8

(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
9
8
999888;
(6)−2.5÷
5
8
×(−
1
4
)=
5
2
×
8
5
×
1
4
=1.
−2.5÷
5
8
555888×(−
1
4
111444)=
5
2
×
8
5
×
1
4
=1.
5
2
555222×
8
5
888555×
1
4
111444=1.