题目内容

计算下面各题(能简算的简算).
200-180÷15×2
46.71-6.81-3.19
3
5
×15×
2
9
1
3
÷(
2
3
-
2
5
)×
3
5
5
13
×
1
7
+
6
7
÷
13
5
9
8
÷[(
2
5
+
1
10
)×
3
4
].
(1)200-180÷15×2,
=200-12×2,
=200-24,
=176;

(2)46.71-6.81-3.19,
=46.71-(6.81+3.19),
=46.71-10,
=36.71;

(3)
3
5
×15×
2
9

=9×
2
9

=2;

(4)
1
3
÷(
2
3
-
2
5
)×
3
5

=
1
3
÷
4
15
×
3
5

=
1
3
×
15
4
×
3
5

=
3
4


(5)
5
13
×
1
7
+
6
7
÷
13
5

=
5
13
×
1
7
+
6
7
×
5
13

=
5
13
×(
1
7
+
6
7
),
=
5
13
×1,
=
5
13


(6)
9
8
÷[(
2
5
+
1
10
)×
3
4
],
=
9
8
÷[
1
2
×
3
4
],
=
9
8
÷
3
8

=
9
8
×
8
3

=3.
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