问题 解答题
下面各题怎样简便就怎样算.
6.3×8.7+8.7×3.7
1
3
-
1
6
+
1
4
)×12
7
4
×
5
8
+
1
4
÷
8
5

3
7
-
3
7
÷3
9
20
÷[
1
2
×(
2
3
+
4
5
)].
答案

(1)6.3×8.7+8.7×3.7

=(6.3+3.7)×8.7

=10×8.7

=87

(2)(

1
3
-
1
6
+
1
4
)×12

=

1
3
×12-
1
6
×12+
1
4
×12

=4-2+3

=5

(3)

7
4
×
5
8
+
1
4
÷
8
5

=

7
4
×
5
8
+
1
4
×
5
8

=(

7
4
+
1
4
)×
5
8

=2×

5
8

=

5
4

(4)3÷

3
7
-
3
7
÷3

=3×

7
3
-
3
7
×
1
3

=7-

1
7

=6

6
7

(5)

9
20
÷[
1
2
×(
2
3
+
4
5
)]

=

9
20
÷[
1
2
×
22
15
]

=

9
20
÷
11
15

=

9
20
×
15
11

=

27
44

单项选择题
判断题