问题 解答题
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
].
答案

(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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