①7.2÷8×4-(0.77+0.33)②(數(shù)學(xué)公式+18%)÷9③(125+75%)×8
④0.9+99×0.9+1.9×4×0.5⑤1.25×32×25%⑥962÷37-222÷37.

解:
①7.2÷8×4-(0.77+0.33),
=7.2÷8×4-1.1,
=0.9×4-1.1,
=3.6-1.1,
=2.5;

②(+18%)÷9,
=÷9+18%÷9,
=0.1+0.02,
=0.12;

③(125+75%)×8,
=125×8+0.75×8,
=1000+6,
=1006;

④0.9+99×0.9+1.9×4×0.5,
=0.9×(1+99)+1.9×(4×0.5),
=0.9×100+1.9×2,
=90+3.8,
=93.8;

⑤1.25×32×25%,
=1.25×(4×8)×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;

⑥962÷37-222÷37,
=(962-222)÷37,
=740÷37,
=20.
分析:①先算加法,再算除法,再算乘法,最后算減法;
②根據(jù)乘法分配律進(jìn)行計(jì)算;
③根據(jù)乘法分配律進(jìn)行計(jì)算;
④根據(jù)乘法分配律和乘法結(jié)合律進(jìn)行計(jì)算;
⑤根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
⑥根據(jù)乘法分配律進(jìn)行計(jì)算.
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)行計(jì)算,能簡(jiǎn)算的要簡(jiǎn)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)算下面各題.
6.4÷4=
7.5÷5= 12.3+0.8=
16×0.5= 14-7= 23.6-0.6=
0.4×0.6= 7.2÷8= 4.5÷9=
8.7+5.6= 0.25×4= 0.32+8=

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

在橫線里填上“>”或“<”.
0.25×0.38
0.38     4.75÷0.95
4.75    7.2×8.4
7.2        3.48÷2.5
3.48.

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

直接寫(xiě)出下列各題的得數(shù),你是最快的!
2.1+3.4=
5.5
5.5
720-80=
640
640
2.6-1.7=
0.9
0.9
1.4-0.6=
0.8
0.8
0.3×40=
12
12
1.25×3×8=
30
30
3.8×0=
0
0
0.9+99×0.9=
90
90
7÷1.4=
5
5
390×0.02=
7.8
7.8
2.5+1.8=
4.3
4.3
6.5×4×0.2=
5.2
5.2
5
6
=
6
2
3
6
2
3
5
8
÷
3
8
=
1
2
3
1
2
3
44÷
11
10
=
40
40
4×(0.6+1.9)=
10
10
1
5
+
1
4
=
9
20
9
20
0.9-0.26=
0.64
0.64
14.5+9.5=
24
24
(0.18+0.9)÷9=
0.12
0.12
18÷36=
0.5
0.5
1.9×4×0.5=
3.8
3.8
7.2÷8×4=
3.6
3.6
78-0.8=
77.2
77.2
62-35=
27
27
20×5.5=
110
110
1.68+1.5=
3.18
3.18
3
4
×12=
9
9
8.3+1.7=
10
10
11.3-8.6=
2.7
2.7
2.4-0.5=
1.9
1.9
1
9
÷
2
3
=
1
6
1
6
3
2
+
1
2
=
2
2
3.25×4=
13
13
2
3
÷2=
1
3
1
3
6
7
÷3=
2
7
2
7
24×5=
120
120
0.77+0.33=
1.1
1.1
7
8
×
1
7
=
1
8
1
8
12.6÷3=
4.2
4.2
3.14×25=
78.5
78.5
3.14×36=
113.04
113.04
0.082=
0.0064
0.0064
8л=
25.12
25.12
1.4:
1.75
1.75
=
16
20
=
8
8
÷10=
80
80
%

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

14÷3.5= 0.6+0.45=
4
5
×
3
4
=
1
2
÷
4
5
=
13×5÷5= 7.2÷8×4= 2-
1
5
-
4
5
=
1
8
+
3
4
)×4=
31×98= 318÷4≈ 39.02÷1.99=
118
119
×3.14

查看答案和解析>>

科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:

直接寫(xiě)出得數(shù).
236-98=
15×
1
5
=
3.25×4=
2
3
÷2
=
9-0.26=
1
2
+
2
5
=
1.4+0.7= 14÷35=
5+11.6+4.5=
5
4
×8+8÷
1
4
=
7.2÷8×4= 4-
3
8
-1
5
8
=

查看答案和解析>>

同步練習(xí)冊(cè)答案