试题:
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:

我来补答
(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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