脫式計算1 10 1 25

2021-03-17 01:36:34 字數 7105 閱讀 4714

1樓:雪中送炭新野

(10-1÷25)÷99.6÷0.01

=(10-0.04)÷99.6÷0.01

=9.96÷99.6÷0.01

=0.1÷0.1=1

脫式計算.(其中 ④⑤兩小題必簡算

2樓:念傜

①[(10-1÷25)÷99.6]÷0.01=[9.96÷99.6]÷0.01

=0.1÷0.01

=10②3

7÷[37+4

7×(1-18)]

=37÷[37+12

]=37÷13

14=6

13③[0.85-(9

16-0.15)]×8

21=[0.85+0.15-9

16]×8

21=7

16×8

21=1

6④3.6×312

5+3.14×64

=3.6×31.4+31.4×6.4

=(3.6+6.4)×31.4

=10×31.4

=314⑤58

×17÷9+3÷8×17

9=(58+3

8)×17

9=1×17

9=179

脫式計算,能簡算的要簡算: 46.5×99+46.5 12.5÷2.5÷0.4  2.6×1.9÷2.6×1.9 (7.7+1.54)

3樓:手機使用者

(1)46.5×99+46.5

=46.5×(99+1)

=46.5×100

=4650

(2)12.5÷2.5÷0.4

=12.5÷(2.5×0.4)

=12.5÷1

=12.5

(3)2.6×1.9÷2.6×1.9

=2.6÷2.6×1.9×1.9

=1×1.9×1.9

=3.61

(4)(7.7+1.54)÷0.7

=9.24÷0.7

=13.2

(5)10.8÷[(4.62-1.92)×4]=10.8÷[2.7×4]

=10.8÷10.8

=1(6)2.6×(2.139÷9.3×6.2)=2.6×(0.23×6.2)

=2.6×1.426

=3.7076

用遞等式計算,能簡便計算的要簡算.(1)2.01×1.53÷0.18(2)5.86×99.4+5.86×0.6(3)2.2×2.2+2.2

4樓:匿名使用者

(1)2.01×1.53÷0.18,

=3.0753÷0.18,

=17.085;

(2)5.86×99.4+5.86×0.6,=5.86×(99.4+0.6),

=5.86×100,

=586;

(3)2.2×2.2+2.2×7.8,

=2.2×(2.2+7.8),

=2.2×10,

=22;

(4)0.25×(4.83-0.85),

=0.25×3.98,

=0.25×4-0.25×0.02,

=1-0.005,

=0.995;

(5)(12.5+1.25+0.125)×8,=12.5×8+1.25×8+0.125×8,=100+10+1,

=110+1,

=111;

(6)(148.4-90.85)÷2.5,=57.55÷2.5,

=23.02.

小學五年級500到脫式計算題

5樓:阿維

1、0.125×96

解析:此題先利用減法分配律把96轉換成(100-4),再利用乘法結合律,使得運算簡便。

0.125×96

=0.125×(100-4)

=0.125×100-0.125×4

=12.5-0.25

=122、33333x44444+66666x77778

解析:33333x44444可以變換為66666×22222,提取公約66666,變換為66666×(22222+77778)再用乘法分配律來脫式計算。

33333x44444+66666x77778

=33333×2×22222+66666×77778

=66666×22222+66666×77778

=66666×(22222+77778)

=66666×100000

=6666600000

3、30-(3.8+0.75)

解析:此題主要利用加法結合律和分配律,先把3.8變換成(4-0.

2),0.75變換成(1-0.25),再利用加法交換律,先算整數,再算小數,最後利用加法結合律,去掉括號運算。

30-(3.8+0.75)

=30-[(4-0.2)+(1-0.25)]

=30-[(4+1)-(0.2+0.25)]

=30-(5-0.45)

=30-5+0.45

=25.45

4、3.6×2.5

解析:此題先利用乘法分配律把3.6轉化成9×0.4,再利用乘法交換律湊整使得運算簡便。

3.6×2.5

=9×0.4×2.5

=1×9

=95、555×15+111×25

解析:此題先把555變換成111×5,再利用運用乘法分配律和提取公約數來脫式計算。

555×15+111×25

=111×5×15+111×25

=111×(5×15)+111×25

=111×75+111×25

=111×(75+25)

=111×100

=11100

6、98×8/99

解析:此題先利用減法分配律把98轉換成(99-1),再利用乘法結合律使得運算簡便。

98×8/99

=(99-1)×8/99

=99×8/99-1×8/99

=8-8/99

=7又91/99

7、0.9+9.9+99.9+999.9+9999.9

解析:此題先找規律,5個數都差0.1可湊整,先利用湊整法變換一下,再利用加法結合律(a+b)+c=a+(b+c),來進行脫式計算。

0.9+9.9+99.9+999.9+9999.9

=(1-0.1)+(10-0.1)+(100-0.1)+(1000-0.1)+(10000-0.1)

=1+10+100+1000+10000-0.1×5

=11111-0.5

=11110.5

6樓:雨下的櫻花

4.8+3.1

0.456+6.22+3.78

15.89+(6.75-5.89)

4.02+5.4+0.98

5.17-1.8-3.2

13.75-(3.75+6.48)

3.68+7.56-2.68

7.85+2.34-0.85+4.66

35.6-1.8-15.6-7.2

3.82+2.9+0.18+9.1

9.6+4.8-3.6

7.14-0.53-2.47

5.27+2.86-0.66+1.63

13.35-4.68+2.65

73.8-1.64-13.8-5.36

47.8-7.45+8.8

0.398+0.36+3.64

15.75+3.59-0.59+14.2566.86-8.66-1.34

0.25×16.2×4

(1.25-0.125)×8

3.6×102

3.72×3.5+6.28×3.5

36.8-3.9-6.1

15.6×13.1-15.6-15.6×2.14.8×7.8+78×0.52

32+4.9-0.9

4.8×100.1

56.5×9.9+56.5

7.09×10.8-0.8×7.09

25.48-(9.4-0.52)

4.2÷3.5

320÷1.25÷8

18.76×9.9+18.76

3.52÷2.5÷0.4

3.9-4.1+6.1-5.9

5.6÷3.5

9.6÷0.8÷0.4

4.2×99+4.2

17.8÷(1.78×4)

0.49÷1.4

1.25×2.5×32

15.2÷0.25÷4

0.89×100.1

146.5-(23+46.5)

3.83×4.56+3.83×5.44

4.36×12.5×8

9.7×99+9.7

27.5×3.7-7.5×3.7

8.54÷2.5÷0.4

0.65×101

(45.9-32.7)÷8÷0.125

3.14×0.68+31.4×0.032

5.6÷1.25÷0.8÷2.5÷0.4

7.2×0.2+2.4×1.4

8.9×1.01

7.74×(2.8-1.3)

7樓:凌月霜丶

0.35×1.6+0.35×3.4

6.72-3.28-1.72

0.45+6.37+4.55

5.4+6.9×3-(

25-2.5)2×41846-620-3804.8×46+4.8×54

0.8+0.8×2.5

1.25×3.6×8×2.5-12.5×2.428×12.5-12.5×20

23.65-(3.07+3.65)

(4+0.4×0.25)8×7×1.25

1.65×99+1.65

27.85-(7.85+3.4)

48×1.25+50×1.25×0.2×87.8×9.9+0.78

(1010+309+4+681+6)×123×9146×782×6×854

5.15×7/8+6.1-0.60625

39.(284+16)×(512-8208÷18)40.120-36×4÷18+35

41.(58+37)÷(64-9×5)

42.(6.8-6.

8×0.55)÷8.543.

0.12× 4.8÷0.

12×4.844.(3.

2×1.5+2.5)÷1.

6 (2)3.2×(1.5+2.

5)÷1.6

45.6-1.6÷4= 5.

38+7.85-5.37=46.

7.2÷0.8-1.

2×5= 6-1.19×3-0.43=47.

6.5×(4.8-1.

2×4)= 0.68×1.9+0.

32×1.9

48.10.15-10.

75×0.4-5.749.

5.8×(3.87-0.

13)+4.2×3.7450.

32.52-(6+9.728÷3.

2)×2.551.[(7.

1-5.6)×0.9-1.

15] ÷2.552.5.

4÷[2.6×(3.7-2.

9)+0.62]53.12×6÷(12-7.

2)-6 (4)12×6÷7.2-6

8樓:新野旁觀者

6/7+2/15+1/7+13/15

19/21+5/7-3/14

2/3+5/9-2/3+5/9

8/9+(1/4-1/9)+3/4

0.58+5/13+1.12+8/13

11-4/11-7/11

22+55÷11-2/8

1/7+33.5+6/7-3.5

7.09-5/12+12.03-7/12

14/15-(6/15 +1/3)

13/5-0.81 -0.19

7/8+1/8 -5/9 -4/9

5 -(0.5 -3/10 )

7.68 - 7.68×0.5

5.2+4.8×3.5

7.8×6.9+2.2×6.9

5.6×0.25 8×(20-1.25)

127+352+73+44

25+71+75+29 +88 (

243+89+111+57

9405-2940÷28×21

920-1680÷40÷7 690+47×52-398148+3328÷64-75 360×24÷32+7302100-94+48×54 51+(2304-2042)×234215+(4361-716)÷81 (247+18)×27÷2536-720÷(360÷18) 1080÷(63-54)×80(528+912)×5-6178 8528÷41×38-904264+318-8280÷69 (174+209)×26- 9000814-(278+322)÷15 1406+735×9÷453168-7828÷38+504 796-5040÷(630÷7)285+(3000-372)÷36

(-54)x1/6x(-1/3)

18.1+(3-0.299÷0.23)×1 2(6.8-6.8×0.55)÷8.5

0.12× 4.8÷0.12×4.8

(3.2×1.5+2.5)÷1.6

3.2×(1.5+2.5)÷1.6 5.6-1.6÷4=38+7.85-5.37=

7.2÷0.8-1.2×5= 6-1.19×3-0.43=6.5×(4.8-1.2×4)=

0.68×1.9+0.32×1.9

10.15-10.75×0.4-5.7

5.8×(3.87-0.

13)+4.2×3.7432.

52-(6+9.728÷3.2)×2.

5[(7.1-5.6)×0.

9-1.15] ÷2.55.

4÷[2.6×(3.7-2.

9)+0.62]12×6÷(12-7.2)-6

12×6÷7.2-6

33.02-(148.4-90.85)÷2.57×(5/21+9/714)

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