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计算,能简便的要简算.(1)7.15+110÷(3.2×2.3)(2)5.6×[10÷(6110−1.8×103)](3)1114÷(364×447−447×294)(4)1+2-3-4+5+6-7-8+9+…+1993(5)58÷[211×(15+16)](6)6÷[1÷(2.1-2.09)].

题目详情
计算,能简便的要简算.
(1)7.15+110÷(3.2×2.3)
(2)5.6×[10÷(
61
10
−1.8×
10
3
)]
(3)
11
14
÷(
36
4
×
44
7
44
7
×
29
4
)
(4)1+2-3-4+5+6-7-8+9+…+1993
(5)
5
8
÷[
2
11
×(
1
5
+
1
6
)]
(6)6÷[1÷(2.1-2.09)].
▼优质解答
答案和解析
(1)7.15+110÷(3.2×2.3)
=7.15+110÷7
9
25

=7.15+14
87
92

=22
11
115


(2)5.6×[10÷(
61
10
−1.8×
10
3
)]
=5.6×[10÷(6.1-6)],
=5.6×[10÷0.1],
=5.6×100,
=560;

(3)
11
14
÷(
36
4
×
44
7
44
7
×
29
4
)
=
11
14
÷[(
36
4
-
29
4
)×
44
7
],
=
11
14
÷[
7
4
×
44
7
],
=
11
14
÷11,
=
1
14


(4)1+2-3-4+5+6-7-8+9+…+1993
=(1+2-3-4)+(5+6-7-8)+9+…+(1989+1990-1991-1992)+1993,
=-4×498+1993,
=-1992+1993,
=1;

(5)
5
8
÷[
2
11
×(
1
5
+
1
6
)]
=
5
8
÷[
2
11
×
11
30
],
=
5
8
÷
1
15

=9
3
8


(6)6÷[1÷(2.1-2.09)]
=6÷[1÷0.01],
=6÷100,
=0.06.