简便计算:1.6 1 4 ,简便计算:1.6÷1/4÷2/5

2020-12-03 21:30:12 字数 5741 阅读 2249

1楼:宝宝

简便计算:1.6÷1/4÷2/5

解:采用结合律,

原式=1.6÷(1/4x2/5)

=1.6÷1/10

=1.6x10=16

2楼:kz菜鸟无敌

1.6÷1/4÷2/5

=1.6÷0.4÷1/4

=4÷1/4=16

6.75÷1/4÷2/5的简便计算

3楼:当代启示录

6.75÷1/4÷2/5

=6.75×4×2.5

=6.75×(4×2.5)

=6.75×10

=67.5

4楼:辽阳张

原式=6.75÷(1/4×2/5)

=6.75÷1/10

=67.5

[1-(1/4 2/5)]÷3.5简便计算?

5楼:妙酒

列式计算

[1-(1/4+ 2/5)]÷3.5

=(1-13/20)÷7/2

=7/20÷7/2

=1/10

6楼:青木桑

原式=(1-13/20)÷7/2

=7/20÷7/2

=1/10

简便计算: 1. 3.625÷5/32+6又2/5×3/8+6.4 2. 45÷5/8+1.6+4.4×1又3/5 3. 8/9×【3/4-(7/16-0.25)】

7楼:匿名用户

1. 3.625÷5/32+6又2/5×3/8+6.4=3.625×32/5+

6.4×3/8+6.4×1

=3.625×6.4+6.4×0.375+6.4×1=6.4×(3.625+0.375+1)

=6.4×5

=322. 45÷5/8+1.6+4.

4×1又3/5=45×8/5+1.6×1+4.4×1.

6=45×1.6+1.6×1+4.

4×1.6=1.6×(45+1+4.

4)=1.6×50.4

=1.6×(50+0.4)

=1.6×50+1.6×0.4

=80+0.64

=80.64

3. 8/9×【3/4-(7/16-0.25)】=8/9×【3/4-(7/16-1/4)】=8/9×【3/4-7/16+1/4】

=8/9×【3/4+1/4-7/16】

=8/9×【1-7/16】

=8/9×9/16

=1/2

4. 6.3×29又4/5+2.98×37=6.3×29.8+2.98×37

=63×2.98+2.98×37

=2.98×(63+37)

=2.98×100

=298

5. 3.6×31又2/5+314×0.

63+3.14=3.6×31.

4+314×0.63+3.14=36×3.

14+3.14×63+3.14×1=3.

14×(36+63+1)

=3.14×100

=314

6. 72×61又3/10+73.8*2又4/5=72×61.3+73.8×2.8

=72×61.3+(72×1.025×2.8)=72×61.3+72×(1.025×2.8)=72×61.3+72×2.87

=72×(61.3+2.87)

=72×64.17

=4620.24

7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5

=(10+100+1000+10000)+(1/5+1/5+1/5+1/5+1/5)

=11110+1

=11111

8楼:妙酒

1. 3.625÷5/32+6又2/5×3/8+6.4=3又5/8x32/5+32/5x3/8+6.4=(3又5/8+3/8)x6.4+6.4

=4x6.4+6.4

=(4+1)x6.4

=5x6.4

=322. 45÷5/8+1.6+4.4×1又3/5=45x8/5+8/5+4.4x8/5

=(45+1+4.4)x8/5

=(50+0.4)x8/5

=50x8/5+0.4x8/5

=80+0.64

=80.64

3. 8/9×【3/4-(7/16-0.25)】=8/9x(3/4-7/16+1/4)

=8/9x(1-7/16)

=8/9x9/16

=1/2

4. 6.3×29又4/5+2.98×37=6.3x29.8+29.8x0.1x37=29.8x(6.3+3.7)

=29.8x10

=298

5. 3.6×31又2/5+314×0.

63+3.14=3.6x31.

4+31.4x10x0.63+31.

4x0.1=31.4x(3.

6+6.3+0.1)

=31.4x10

=314

6. 72×61又3/10+73.8*2又4/5=72x61.3+73.8x2.8

=4413.6+206.64

=4620.24

7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5

=10000+1000+100+10+1/5x5=11111

9楼:围观者

1.原式=3.625*(32/5)+(32/5)*0.375+32/5=(32/5)*(3.625+0.375+1)=(32/5)*5=32

2.原式=45*(8/5)+8/5+4.4*(8/5)=(8/5)*(45+1+4.4)=80.64

3.原式=8/9 *(3/4-7/16+1/4)=8/9 * 9/16=1/2

4.原式=6.3*29.8+2.98*37=2.98*(63+37)=2.98*100=298

5.原式=3.6*31.4+314*0.63+3.14=3.14*(36+63+1)=3.14*100=314

6.题没抄错吧

7.原式=1/5+10+1/5+100+1/5+1000+1/5+10000+1/5=11111

4/5÷[(3/5+1/2)×2]的简便计算

10楼:匿名用户

4/5÷[(3/5+1/2)×2]

4/5÷[(3/5+1/2)×2]简便计算解:原式=4/5÷(3/5x2+1/2x2)=4/5÷(6/5+1)

=4/5÷11/5

=4/11

扩展资料1、四则混合运算顺序:同级运算时,从左到右依次计算;两级运算时,先算乘除,后算加减。有括号时,先算括号里面的,再算括号外面的;有多层括号时,先算小括号里的,再算中括号里面的,再算大括号里面的,最后算括号外面的。

要是有乘方,最先算乘方。

2、乘法是加法的简便运算,除法是减法的简便运算。减法与加法互为逆运算,除法与乘法互为逆运算。几个加数相加,可以任意交换加数的位置;或者先把几个加数相加再和其他的加数相加,它们的和不变。

一个数减去两个数的和,等于从这个数中依次减去和里的每一个加数。

11楼:妙酒

4/5÷[(3/5+1/2)×2]

=4/5÷(3/5x2+1/2x2)

=4/5÷(6/5+1)

=4/5÷11/5

=4/11

12楼:匿名用户

5/4ⅹ14/15ⅹ11/4=3

四计算题:x÷2/3-1/4=3/4 简便运算:1/12÷5/12+1/4×2/5 3/4+7/9+1/4-4/9

13楼:春秋暖

(1/2+1/3)÷

5 = (3/6 + 2/6) ÷ 5 =5/6 ÷ 5 = 1/6[(2/3+1/4)×3/4]÷5/8 = [(8/12 + 3/12)×3/4]÷5/8 = [11/12×3/4]÷5/8

= 11/16÷5/8 = 11/16 * 8/5 = 11/10 = 1.1

五、工资分解后为 2700元

回 = 800元 + 500元 + 1400元根据税法规定,李叔叔答应交的税为 0元 + 500元 * 5% + 1400元 * 10%

= 0元 + 25元 + 140元

= 165元

14楼:梦花的呼吸

(1/2+1/3)÷

du5 = (3/6 + 2/6) ÷ 5 =5/6 ÷ 5 = 1/6

[(zhi2/3+1/4)×

dao3/4]÷5/8 = [(8/12 + 3/12)×3/4]÷5/8 = [11/12×3/4]÷5/8

= 11/16÷5/8 = 11/16 * 8/5 = 11/10 = 1.1

五、专 2700元

属 = 800元 + 500元 + 1400元0元 + 500元 * 5% + 1400元 * 10%= 0元 + 25元 + 140元

=25+140

= 165元

[1-(1/4 +2/5)]÷3.5的简便计算?

15楼:当代启示录

可以把分数化成小数计算:[1-(1/4 +2/5)]÷3.5

=[1-(0.25+0.4)]÷3.5

=(1-0.65)÷3.5

=0.35÷3.5

=0.1

16楼:妙酒

[1-(1/4 +2/5)]÷3.5

=(1-0.25-0.4)÷3.5

=0.35÷3.5

=0.1

17楼:匿名用户

[1-(1/4 +2/5)]÷3.5

=(1-13/20)÷(7/2)

=7/20x2/7

=1/10

=10分之1

(1/2-1/4÷3)x2/5+2/5能简便计算吗

18楼:匿名用户

能。原式=(1/2-1/12)*2/5+1*2/5=(5/12+1)*2/5

=17/12*2/5

=17/30.望采纳

19楼:匿名用户

=(1/2-1/12)x2/5+2/5

=5/12x2/5+2/5

=1/6+2/5

=5/30+12/30

=17/30

20楼:

=(6/12-1/4×3)×2/5+2/5=5/12×2/5+2/5

=1/6+12/30

=5/30+12/30

=17/30

3/5÷4-2/5×1/4简便运算。

21楼:妙酒

=3/5x1/4-2/5x1/4

=(3/5-2/5)x1/4

=1/5x1/4

=1/20

22楼:小桥阿水

=3/5×1/4-2/5×1/4

=(3/5-2/5)×1/4

=1/5×1/4

=1/20

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