问题 解答题
脱式计算(带●的要简算)
13.25-18÷4.5+7.61÷[(
1
4
-10%)÷
3
2
]
5
7
÷9+
4
7
×
1
9
6
5
×(
2
9
×
6
5
+
5
6
答案

(1)13.25-18÷4.5+7.6,

=13.25-4+7.6,

=9.25+7.6,

=16.85;

(2)1÷[(

1
4
-10%)÷
3
2
],

=1÷[(

1
4
-
1
5
)÷
3
2
],

=1÷[

1
20
×
2
3
],

=1÷

1
30

=1×30,

=30;

(3)

5
7
÷9+
4
7
×
1
9

=

5
7
×
1
9
+
4
7
×
1
9

=(

5
7
+
4
7
)×
1
9

=

9
7
×
1
9

=

1
7

(4)

6
5
×(
2
9
×
6
5
+
5
6
),

=

6
5
×
2
9
×
6
5
+
5
6
×
6
5

=

8
25
+1,

=1

8
25

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