3.47×6.5+6.53×6.586.3×19-86.3×966.96÷72-0.87.

解:(1)3.47×6.5+6.53×6.5,
=(3.47+6.53)×6.5,
=10×6.5,
=65;

(2)86.3×19-86.3×9,
=86.3×(19-9),
=86.3×10,
=863;

(3)66.96÷72-0.87,
=0.93-0.97,
=0.06.
分析:(1)(2)運用乘法分配律簡算;
(3)先算除法,再算減法.
點評:此題是考查四則混合運算,要仔細觀察算式的特點,靈活運用一些定律進行簡便計算.
練習冊系列答案
相關(guān)習題

科目:小學數(shù)學 來源: 題型:

脫式計算.(能簡算的用簡算)
3.47×6.5+6.53×6.5 86.3×19-86.3×9 66.96÷72-0.87.

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:

3.3×2= 2.4×0.5= 0.6×0.9= 0.2×0.3=
0.39+0.61= 10-7.2= 0.88+1.1= 0.75×4=
11-1.5= 4.48-4= 7.8-0.8= 2.8×5=
4×0.3= 4×0.25= 3.2+1.6= 10.6-5.2=
0.32+1.68= 8×125= 7.28+7= 0.8+39.2=
43+0.01= 0.4×2= 1.5×6= 1×0.04=
1.53-0.5= 1.5-0.6= 0.3+1.5= 95÷5=
0.65+4.35= 14-7.4= 11.2-9.8= 4.4×2=
35-25= 56-26= 45+15= 35-15=
38+28= 15+25= 12+12= 47-27=
13+23= 1-12= 14+14= 212+312=
14-0= 610-510= 1-23= 0+56=
78-38= 29+29= 58-48= 15+45=
0.9×125×8= 5.75+1.37+4.25= 0.43×10+5.7= 62-2.8-1.2=
2.7×4+2.7×6= 0.25×0.5×4=

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:閱讀理解

1.
(1)438+203 (2)256+199 (3)416-302 (4)325-198
(5)278+498 (6)3.6+2.7+6.4+7.3 (7)
4
9
+
5
6
+
5
9
+2
1
6
(8)1.3+4.25+3.7+3
(9)1874-324-476 (10)5-1.4-1.6 (11)30-8.12-4.13-7.75 (12)
7
8
-
4
5
+
1
8
(13)4.3-2.45+5.7-6.55 (14)125×48 (15)25×32 (16)35×1.4
(17)1.25×88 (18)0.25×444 (19)32×0.25×12.5 (20)25×80×0.04×125
(21)1.9×4×0.5 (22)25×1.25×4×0.8 (23)(1.6+1.6+1.6+1.6)×2.5 (24)(0.7+0.7…+0.7)×12.5(80個0.7相加)
(24)9.9×8.6+8.6 (25)99×5.4
(26)4.8×1.01 (27)95×101-95 (28)95×102-190 (29)95.6×18+0.4×18
(30)(
1
3
-
1
6
+
1
4
)×12
(31)(
1
3
+
1
8
-
1
24
)÷
1
24
(32)24×(
1
3
+
1
8
-
1
24
(33)24÷(
1
3
+
1
8
-
1
24
(34)1.25×3.6+1.25×3
2
5
+1
1
4
(35)3.3×
3
4
+0.75×5
7
10
+75%
(36)2
1
2
×6.6+7.5×6
3
5
(37)9.56×180-95.6×8
(38)4.8×37+47×6.3 (39)9.5×8.8+0.12×95 (40)
19
20
×21
(41)
7
30
×33
(42)
2
45
÷
1
46
(43)
2
45
÷
1
48
(44)
2
45
÷42
(45)6×0.75+5×
3
4
-3÷4
(46)5.4÷1.2÷5 (47)270÷18 (48)120÷(1.2×4) (49)73÷0.8÷12.5
(50)16÷2.5 (51)48÷1.25 (52)
3
7
-(
1
2
-
3
7
)+
1
2
(53)84-(54-16)
(54)84-(54+16) (55)9999×7778+3333×6666 (56)3.6×31.4+43.9×6.4 (57)(
3
4
+
5
6
)×
12
5
(58)
7
9
×
13
14
+
2
9
÷
14
13
(59)
23
20
-
1
3
-
2
3
(60)
6
11
×
7
8
-
6
8
×
5
11
(61)
1
2
×
1
4
÷
1
2
×
1
4
(62)
25
17
-
1
3
×
9
8
-
5
8
(63)
8
9
×[
3
7
÷(
2
3
+
1
7
)]
(64)(0.9+5)×3+2.3 (65)56×
1
57
(66)
3
4
+
1
4
÷
3
4
+
1
4
(67)(
3
4
+
1
4
)÷(
3
4
+
1
4
(68)
7
15
÷(
7
30
-
1
15
(69)(
7
30
-
1
15
)÷
7
15
(70)7.2÷(5-0.75-0.25) (71)6.4+3.6÷0.5+4.5 (72)(6.4+3.6)÷0.5+4.5 (73)495÷55+495÷45
(74)8÷0.4+8÷1.6 (75)0.9+99×0.9 (76)5.28-(1.62+2.28) (77)
5
9
-
5
9
+
4
9
(78)4×(
3
8
+)
(79)
5
9
+
3
11
++
(80)2-(
1
2
+
1
25
)-
23
50
(81)
7
18
×
1
4
+
3
4
×
7
18
(82)
7
10
×
11
14
+
11
14
×
3
10
(83)
7
8
×9+
7
8
(84)(5+
5
16
)×
4
5
(85)(
1
6
+
1
8
)×24
(86)(20+
4
7
)×
7
10
(87)
1
13
×39×
8
21
(88)
7
3
×(
3
7
+
3
28
(89)(
1
4
-
1
6
)×12
(90)
40
13
×(26×
3
40
(91)
1
7
+
7
9
+
6
7
+
2
9
(92)17×
3
8
-
3
8
(93)(
8
5
+
8
3
)×
5
8
(94)(
13
24
+
13
16
)÷
13
16
(95)(
3
8
+
3
11
)÷3
(96)(
1
27
-
1
36
)÷
1
9
(97)
3
7
÷
7
11
+
4
7
÷
7
11
(98)
4
5
×(10+
5
6
(99)(21+
7
15
)÷
7
5
(100)
7
13
×
3
4
6
13
(101)
5
2
÷
4
17
+
3
2
÷
4
17
(102)(
5
18
-
5
24
)÷
5
6
(103)
2
3
×
7
3
+
4
5
+
(104)
25
17
_
1
3
×
9
8
-
5
8
(105)
12
7
-(
1
3
÷
7
15
+
4
13
(106)
5
7
+
9
8
×
5
9
+
3
8
(107)1-
5
8
÷
25
28
-
3
10
(108)
1
4
×
3
7
+÷4
(109)5-(4+
6
13
(110)1125-997 (111)7.46-0.83-2.17 (112)12.85-1.17-8.83+1.15 (113)4.5×102
(114)0.4×6.3×25 (115)(4.9+4.9+…+4.9)×2.5(16個4.9相加) (116)7.5×199 (117)(
1
9
+
1
12
)×36
(118)1.2×5.7-1.2+5.3×1.2 (119)0.825×102-82.5 (120)46×
2
45
(121)560÷16÷5
(122)3÷2.5 (123)84+(54-16) (124)
3
11
+
5
12
+
8
11
+
7
12
(125)
12
7
-(
1
3
÷
7
15
+
4
13
(126)3×(
1
12
+
2
15
)+
3
4
(127)7.2÷(5-0.75+0.25) (128)725÷25+275÷25 (129)
1
2
×
1
4
×
2
3
(130)
7
16
×45-
7
16
÷
1
45
(131)48×(
5
6
-
3
8
(132)
12
13
×
4
5
+
1
3
×
1
2
(133)(32+
4
7
)÷4
(134)
1
3
÷
3
8
÷
8
9
(135)46×
2
45
(136)
3
4
×
1
9
+
1
4
÷9

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:

選擇2、5、
3
7
4
7
、1.25、9.6、4之中幾個數(shù),按要求寫出應(yīng)用運算定律能簡便計算的題目.
(1)應(yīng)用加法結(jié)合律
3
7
+
4
7
+4=(
3
7
+
4
7
)+4,
3
7
+
4
7
+4=(
3
7
+
4
7
)+4,

(2)應(yīng)用乘法分配律
4
7
×4
-
3
7
×4=(
4
7
-
3
7
)×4
4
7
×4
-
3
7
×4=(
4
7
-
3
7
)×4

(3)應(yīng)用乘法結(jié)合律
1.25×5×2=1.25×(5×2)
1.25×5×2=1.25×(5×2)

(4)應(yīng)用減法的運算性質(zhì)(連減)
9.6-
3
7
-
4
7
=9.6-(
3
7
+
4
7
9.6-
3
7
-
4
7
=9.6-(
3
7
+
4
7

(5)應(yīng)用除法的運算性質(zhì)(連除)
9.6÷5÷2=9.6÷(5×2)
9.6÷5÷2=9.6÷(5×2)

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:解答題

3.3×2=2.4×0.5=0.6×0.9=0.2×0.3=
0.39+0.61=10-7.2=0.88+1.1=0.75×4=
11-1.5=4.48-4=7.8-0.8=2.8×5=
4×0.3=4×0.25=3.2+1.6=10.6-5.2=
0.32+1.68=8×125=7.28+7=0.8+39.2=
43+0.01=0.4×2=1.5×6=1×0.04=
1.53-0.5=1.5-0.6=0.3+1.5=95÷5=
0.65+4.35=14-7.4=11.2-9.8=4.4×2=
35-25=56-26=45+15=35-15=
38+28=15+25=12+12=47-27=
13+23=1-12=14+14=212+312=
14-0=610-510=1-23=0+56=
78-38=29+29=58-48=15+45=
0.9×125×8=5.75+1.37+4.25=0.43×10+5.7=62-2.8-1.2=
2.7×4+2.7×6=0.25×0.5×4=

查看答案和解析>>

同步練習冊答案