问题 解答题
用简便方法计算
2011×
17
2010
15
16
+
15
13
-
7
16
+
11
13
7
8
+
23
24
)÷
1
48
25%×
7
15
×4×
5
7
答案

(1)2011×

17
2010

=(2010+1)×

17
2010

=2010×

17
2010
+1×
17
2010

=17+

17
2010

=17

17
2010

(2)

15
16
+
15
13
-
7
16
+
11
13

=(

15
16
-
7
16
)+(
15
13
+
11
13
),

=

1
2
+2,

=2

1
2

(3)(

7
8
+
23
24
)÷
1
48

=(

7
8
+
23
24
)×48,

=

7
8
×48+
23
24
×48,

=42+46,

=88;

(4)25%×

7
15
×4×
5
7

=(25%×4)×(

7
15
×
5
7
),

=1×

1
3

=

1
3

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