题目内容

脱式计算(后三个用简便方法计算)
1-
5
7
×
14
15
2
9
×0.375÷
6
7
1
5
÷[(
2
3
+
1
5
)×15]
89×
3
88
7
9
×
5
6
×
3
7
4
11
×
11
6
+
5
11
×
11
6
(1)1-
5
7
×
14
15

=1-
2
3

=
1
3


(2)
2
9
×0.375÷
6
7

=
2
9
×
3
8
×
7
6

=
7
72


(3)
1
5
÷[(
2
3
+
1
5
)×15]
=
1
5
÷[
2
3
×15+
1
5
×15]
=
1
5
÷[10+3]
=
1
5
÷13
=
1
5
×
1
13

=
1
65


(4)89×
3
88

=(88+1)×
3
88

=88×
3
88
+
3
88

=3+
3
88

=3
3
88


(5)
7
9
×
5
6
×
3
7
=
5
18


(6)
4
11
×
11
6
+
5
11
×
11
6

=(
4
11
+
5
11
)×
11
6

=
9
11
×
11
6

=
3
2
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