精英家教网 > 小学数学 > 题目详情
神机妙算:(能简算的要写出简算过程)
(1)( 
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7
(2)
1
8
×78+0.5×1.25-730÷80+24×
51
43
+51×
19
43

(3)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%
(4)[47-(18.75-1÷
8
15
)×2]÷0.46
(5)(0.7×
2
3
-0.11×
5
6
)÷0.125+(
3
2
-
4
3
)÷(
5
6
×
3
4

(1)(
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7,
=
1
4
×28-
1
7
×28+(4
4
7
-3
4
7
)×7,
=7-4+1×7,
=3+7,
=10;

(2)
1
8
×78+0.5×1.25-730÷80+24×
51
43
+51×
19
43

=0.125×78+5×0.125-73×0.125+51×
24
43
+51×
19
43

=(78+5-73)×0.125+51×(
24
43
+
19
43
),
=10×0.125+51×1,
=1.25+51,
=52.25;

(3)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%,
=[22.5+(3
3
5
+1.8-0.55)]÷40%,
=[22.5+(5.4-0.55)]÷40%,
=[22.5+4.85]÷40%,
=27.35÷40%,
=68.375;

(4)[47-(18.75-1÷
8
15
)×2]÷0.46,
=[47-(18.75-1.875)×2]÷0.46,
=[47-16.875×2]÷0.46,
=[47-33.75]÷0.46,
=13.25÷0.46,
=28
37
46


(5)(0.7×
2
3
-0.11×
5
6
)÷0.125+(
3
2
-
4
3
)÷(
5
6
×
3
4
),
=(
7
15
-
11
120
)÷0.125+
1
6
÷
5
8

=
3
8
÷0.125+
1
6
÷
5
8

=3+
4
15

=3
4
15
练习册系列答案
相关习题

科目:小学数学 来源: 题型:

神机妙算:(能简算的要写出简算过程)
(1)( 
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7
(2)
1
8
×78+0.5×1.25-730÷80+24×
51
43
+51×
19
43

(3)[22.5+(3
3
5
+1.8-1.21×
5
11
)]÷40%
(4)[47-(18.75-1÷
8
15
)×2]÷0.46
(5)(0.7×
2
3
-0.11×
5
6
)÷0.125+(
3
2
-
4
3
)÷(
5
6
×
3
4

查看答案和解析>>

科目:小学数学 来源: 题型:

神机妙算:(能简算的要写出简算过程)
(1)(9.6-10
1
2
÷1.25)÷(1
1
3
×75%)  
(2)
1
4
×39+
3
4
×25+
26
4
×
3
13

(3)
39
5
÷[32×(1-
5
8
)+
18
5
]
(4)[1
1
10
+2
7
20
÷(3
1
12
-1.125)]×
9
23
-
1
6

(5)0.125×
3
4
+
1
8
×8.25+12.5%+0.374×48+0.62×37.4-3.74.

查看答案和解析>>

科目:小学数学 来源: 题型:

神机妙算:(能简算的要写出简算过程)
①(20
94
95
×1.65-20
94
95
+
7
20
×20
94
95
)×47.5×80%÷
2
5

2
3
+
1
6
+
1
9
+
1
12
+
1
15
+
1
18

查看答案和解析>>

科目:小学数学 来源: 题型:解答题

神机妙算:(能简算的要写出简算过程)
(1)(9.6-10数学公式÷1.25)÷(1数学公式×75%) 
(2)数学公式×39+数学公式×25+数学公式×数学公式
(3)数学公式÷[32×(1-数学公式)+数学公式]
(4)[1数学公式+2数学公式÷(3数学公式-1.125)]×数学公式-数学公式
(5)0.125×数学公式+数学公式×8.25+12.5%+0.374×48+0.62×37.4-3.74.

查看答案和解析>>

同步练习册答案