问题 解答题
用你喜欢的方法计算:
1
2
-
3
8
)÷
3
4
2-
8
15
×
1
4
6
11
×(
5
9
+
2
3
4
5
-
2
3
)×
15
2
1
2
+
4
5
)×20
101×
2
7
-
2
7
答案

(1)(

1
2
-
3
8
)÷
3
4

=(

4
8
-
3
8
)÷
3
4

=

1
8
×
4
3

=

1
6

(2)2-

8
15
×
1
4

=2-

2
15

=1

13
15

(3)

6
11
×(
5
9
+
2
3
),

=

6
11
×(
5
9
+
6
9
),

=

6
11
×
11
9

=

2
3

(4)(

4
5
-
2
3
)×
15
2

=

4
5
×
15
2
-
2
3
×
15
2

=6-5,

=1;

(5)(

1
2
+
4
5
)×20,

=

1
2
×20+
4
5
×20,

=10+16,

=26;

(6)101×

2
7
-
2
7

=(101-1)×

2
7

=100×

2
7

=28

4
7

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