(1)
7
10
+(
4
7
+
1
2
7
25
(2)[1-(
1
4
+
3
8
)]÷
1
4
(3)(
9
16
+
9
8
3
8
(4)
5
2
÷
1
8
×
1
8
×4
(5)
1
7
+
7
8
×
5
7
+
3
8
(6)
12
5
×(
5
6
+
3
4
)+
4
5
(7)11
1
12
-3
1
7
-2
6
7
(8)3.87÷
3
2
-0.87×
2
3
分析:(1)先算小括號(hào)里面的加法,再算小括號(hào)外面的乘法和加法;
(2)先算小括號(hào)里面的加法,再算中括號(hào)里面的減法,最后算括號(hào)外面的除法;
(3)先算小括號(hào)里面的加法,再算小括號(hào)外面的除法;
(4)先將除法變?yōu)槌朔,再約分計(jì)算即可;
(5)先算乘法,再算加法;
(6)先算小括號(hào)里面的加法,再算小括號(hào)外面的乘法和加法;
(7)根據(jù)連減的簡(jiǎn)算方法計(jì)算即可求解;
(8)根據(jù)乘法分配律計(jì)算即可求解.
解答:
解:(1)
7
10
+(
4
7
+
1
2
7
25
,
=
7
10
+
15
14
×
7
25
,
=
7
10
+
3
10
,
=1;

(2)[1-(
1
4
+
3
8
)]÷
1
4
,
=[1-
5
8
1
4
,
=
3
8
÷
1
4
,
=1
1
2


(3)(
9
16
+
9
8
3
8
,
=
27
16
×
8
3

=4
1
2
;
(4)
5
2
÷
1
8
×
1
8
×4

=
5
2
×8×
1
8
×4,
=10;

(5)
1
7
+
7
8
×
5
7
+
3
8

=
1
7
+
5
8
+
3
8
,
=
1
7
+(
5
8
+
3
8
),
=
1
7
+1,
=1
1
7
;

(6)
12
5
×(
5
6
+
3
4
)+
4
5
,
=
12
5
×
5
6
+
12
5
×
3
4
+
4
5
,
=2+1
4
5
+
4
5

=2+2
3
5
,
=4
3
5


(7)11
1
12
-3
1
7
-2
6
7
,
=11
1
12
-(3
1
7
+2
6
7
),
=11
1
12
-6,
=5
1
12


(8)3.87÷
3
2
-0.87×
2
3
,
=3.87×
2
3
-0.87×
2
3
,
=(3.87-0.87)×
2
3

=3×
2
3
,
=2.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,要仔細(xì)觀察算式的特點(diǎn),靈活運(yùn)用一些定律進(jìn)行簡(jiǎn)便計(jì)算.
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

計(jì)算,我能行.
1
4
+
2
4
=
5
8
-
2
8
=
6
20
+
9
20
=
1-
5
6
=
3
7
+
4
7
=
1-
7
12
=
8
9
-
3
9
=
1-
1
5
=
7
10
-
3
10
=
1
6
+
2
6
=
2
6
+
4
6
=
11
15
+
4
15
=
1
2
+
1
2
=
3
12
+
8
12
=
4
18
+
8
18
=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

(2010?江都市)
直接寫出得數(shù).
0.32×5=
1+
5
8
-1=
402×49≈
4
7
÷14×0=
44-2.1-1.9= 63÷
7
10
=
21÷35= 3.3+2.57=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

直接寫出得數(shù).
7
9
-
4
9
=
1
3
+
1
4
=
2
9
+
1
5
+
7
9
=
1
10
+
3
10
=
1
2
-
1
3
=
1-
5
8
-
3
8
=
0.53=
4
7
+
7
10
-
4
7
=
1
4
-
1
8
+
1
4
-
1
8
=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

直接寫出得數(shù)
1.75+20.5=
12.5×32= 3.75÷0.25= 312÷
3
4
=
7.17-6.4= 1-0.25=
4
7
+
4
7
=
1.6×
5
8
=
710-239= 468÷12=
4
7
+0.5=

查看答案和解析>>

同步練習(xí)冊(cè)答案