题目内容

脱式计算.(能简算的要简算)
1
3
×
4
5
+
1
5
÷3                     
7
9
÷
11
5
+
2
9
×
5
11
            
③[
3
4
-(
7
16
-
1
4
)]÷
1
4
7
12
÷[(
5
9
-
1
3
)×
3
4
]
14
25
×
1
4
+
11
25
×25%           
⑥[45×(
2
9
+
1
3
)]÷5%
1
2
÷(2-
5
6
)×
2
3
                 
⑧(
5
8
-
1
4
)×(
8
9
÷
2
3
)     
1
24
+(
7
16
-
1
4
)÷
1
2
分析:第①②⑤⑥应用乘法分配律简便计算,使计算更加简便,第③④⑦⑧⑨题按分数、整数四则混合运算顺序计算.
解答:
1
3
×
4
5
+
1
5
÷3,
=
1
3
×
4
5
+
1
5
×
1
3

=
1
3
×(
4
5
+
1
5
),
=
1
3
×1,
=
1
3


7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=
5
11
×(
7
9
+
2
9
),
=
5
11
×1,
=
5
11


③[
3
4
-(
7
16
-
1
4
)]÷
1
4

=[
12
16
-(
7
16
-
4
16
)]×4,
=
9
16
×4,
=
9
4

=2
1
4


7
12
÷[(
5
9
-
1
3
)×
3
4
],
=
7
12
÷[(
5
9
-
3
9
)×
3
4
],
=
7
12
÷[
2
9
×
3
4
]
=
7
12
×
6,
=3
1
2


14
25
×
1
4
+
11
25
×25%,
=
14
25
×
1
4
+
11
25
×
1
4

=
1
4
×
14
25
+
11
25
),
=
1
4



⑥[45×(
2
9
+
1
3
)]÷5%,
=[45×
2
9
+45×
1
3
]×20,
=[10+15]×20,
=500;

1
2
÷(2-
5
6
)×
2
3

=
1
2
÷(
12
6
-
5
6
)×
2
3

=
1
2
×
6
7
×
2
3

=
2
7


⑧(
5
8
-
1
4
)×(
8
9
÷
2
3
),
=(
5
8
-
2
8
)×(
8
9
×
3
2
),
=
3
8
×
8
9
×
3
2

=
1
2


1
24
+(
7
16
-
1
4
÷
1
2

=
1
24
+(
7
16
-
4
16
)×2,
=
1
24
+
3
16
×2,
=
1
24
+
3
8

=
1
24
+
9
24

=
5
12
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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