问题 解答题
计算
48×
3
7
+3÷7
7
18
×
1
4
+
3
4
×
7
18
3
10
×[
7
8
÷(
3
5
-
1
4
)].
答案

(1)48×

3
7
+3÷7

=48×

3
7
+
3
7

=(48+1)×

3
7

=49×

3
7

=21;

(2)

7
18
×
1
4
+
3
4
×
7
18

=(

1
4
+
3
4
)×
7
18

=1×

7
18

=

7
18

(3)

3
10
×[
7
8
÷(
3
5
-
1
4
)].

=

3
10
×[
7
8
÷(
12
20
-
5
20
)],

=

3
10
×[
7
8
×
20
7
],

=

3
10
×
20
8

=

3
4

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