问题 解答题
脱式计算
1
3
×
2
5
×
3
10

12×(
1
4
+
1
3
-
1
6

5
7
÷[1÷(
2
3
-
1
5
)].
答案

(1)5×

1
3
×
2
5
×
3
10

=(5×

2
5
)×(
1
3
×
3
10

=2×

1
10

=

1
5

(2)12×(

1
4
+
1
3
-
1
6

=12×

1
4
+12×
1
3
-12×
1
6

=3+4-2

=5;

(3)

5
7
÷[1÷(
2
3
-
1
5
)]

=

5
7
÷[1÷
7
15
]

=

5
7
÷
15
7

=

5
7
×
7
15

=

1
3

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