42(1 7)5 6 11+5 6

2020-12-03 21:37:55 字数 6041 阅读 4493

1楼:匿名用户

42*(1/6+1/7)

=42×1/6+42×1/7

=7+6

=135/6*11+5/6

=5/6×(11+1)

=5/6×12

=1024*(5/6-7/12)

=24×5/6-24×7/12

=20-14

=69/5*2/3*9/10

=9/10×2/3×9/5

=3/5×9/5

=27/25

2楼:雪狼爱在

easy

原式 =2(4/9+5/7+3/11)÷(4/9+5/7+3/11)=2

没错吧 采纳我把!!⊙

42*(5/6-2/7)= 11/12*3/4+11/12*1/4= 3/10÷(4/5-1/2)-5/6=

3楼:匿名用户

42*(5/6-2/7)

=42*5/6-42*2/7

=35-12

=2311/12*3/4+11/12*1/4=11/12*(3/4+1/4)

=11/12

3/10÷(4/5-1/2)-5/6

= (10*3/10)÷(10*(4/5-1/2))-5/6= 3÷(8-5)-5/6

= 1-5/6

=1/6

(数学)3/4+1/3-5/6= 3/8+1/2-1/4= 1/6-1/9+7/12= 1-2/5-2/7= 3/4+(4/5-1/4)= 3/5-(1/10+3/8)=

4楼:甜甜の★微笑

3/4+1/3-5/6=1/4 3/8+1/2-1/4= 5/8 1/6-1/9+7/12=23/36 1-2/5-2/7=11/35 3/4+(4/5-1/4)= 13/10 3/5-(1/10+3/8)=1/8 2/3-(5/6-5/8)= 11/24 2/3-4/7+5/6=13/14

用简便的方法做

7/9+5/7+5/9=34/21 12/25-1/8-1/24=47/150 1-2/5-7/20=1/4

5/8+4/7+9/8-14/1=负数 5/9-(1/3+1/8)=7/72

从4/5里减去1/5与2/7的和,差是多少?

4/5-(1/5+2/7)=11/35

2/5加上7/10,再减去11/20,得多少?

2/5+7/10-11/20=11/20

5/6加上5/8与1/4的差,和是多少?

5/6+(5/8-1/4)=29/24

5楼:懦弱的龙骑士

3/4+1/3-5/6= 9/12+4/12-10/12=1/4

3/8+1/2-1/4= 3/8+2/4-1/4=3/8+1/4=3/8+2/8=5/8

1/6-1/9+7/12= 3/4-1/9=23/36

1-2/5-2/7=1-(14/35+10/35)=11/35

3/4+(4/5-1/4)= 3/4+(16/20-5/20)=15/20+11/20=26/20=13/10

3/5-(1/10+3/8)=6/10--1/10-3/8==1/2-3/8=1/8

2/3-(5/6-5/8)=16/24-(20/24-15/24)=11/24

2/3-4/7+5/6=9/6-4/7=21/14-8/14=13/14

用简便的方法做

7/9+5/7+5/9=(7/9+5/9)+5/7=12/9+5/7=4/3+5/7=28/21+15/21=43/21

12/25-1/8-1/24=12/25-(1/8+1/24)=12/25-(3/24+1/24)=12/25-1/6= 72/150-25/150=47/150

1-2/5-7/20= 1-(8/20+7/20)=1/4

[ 5/8+4/7+9/8-14/1=7/4+4/7-14=49/28+16/28-14=65/28-14= -83/7 ]

5/9-(1/3+1/8)=5/9-1/3-1/8=5/9-3/9-1/8=2/9-1/8=7/72

从4/5里减去1/5与2/7的和,差是多少?

4/5-(1/5+2/7)=4/5-1/5-2/7=3/5-2/7=11/35

2/5加上7/10,再减去11/20,得多少?

(2/5+7/10)-11/20=(4/10+7/10)-11/20=11/10-11/20=22/20-11/20=11/20

5/6加上5/8与1/4的差,和是多少?

5/6+(5/8-1/4)=5/6+(5/8-2/8)=5/6+3/8=20/24+9/24=29/24

6楼:匿名用户

热,通分不行吗!!!!

简便计算 7/9^11/6+2/9*6/11 5^5/7-5/7*1/5 5/16+(7/16-1/4)^1/2

7楼:新野旁观者

7/9^11/6+2/9*6/11

=7/9*6/11+2/9*6/11

=(7/9+2/9)*6/11

=6/11

5^5/7-5/7*1/5

=5*7/5-1/7

=7-1/7

=6又6/7

5/16+(7/16-1/4)^1/2

=5/16+7/32-1/8

=10/32+7/32-4/32

=13/32

8楼:匿名用户

题目应是

7/9*11/6+2/9*6/11

=(7/9+2/9)*6/11

=6/11

5*5/7-5/7*1/5

=(5-1/5)*5/7

=24/5*5/7

=24/7

5/16+(7/16-1/4)*1/2

=(10/16+7/16-4/16)*1/2=(13/16)*1/2

=13/32

1/2+1/6+1/12+1/20+1/30+1/42= 2+4+6+...+2010= (5/9-5/6+1/4)÷(-1/36)= (-19 18/19)*38= 都用简便计算

9楼:匿名用户

1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7=1/2(1+1/3)+1/4(1/3+1/5)+1/6(1/5+1/7)=2/3+2/15+2/35=6/7

首先这是个等差数列,公差为2首项为2 ,2010为第n项,则2+(n-1)*2=2010,计算的n=1005, 则2+4+6+……+2010=1005*(2+2010)/2=1011030

后面的式子看不懂

10楼:kz菜鸟无敌

今天凌晨一点,北京至福州的动车(314次列车)在温州段发生追尾事故,死了很多人,好啊!多死几个吧!死吧!!

幸亏我昨天晚上没空,今晚我要改乘飞机了!

11楼:宁静致远

1/2+1/6+1/12+1/20+1/30+1/42=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7

=1-1/7

=6/7

2+4+6+...+2010

=2×(1+2+3+……+1005)

=2× [ (1+1004)×1004÷2 +1005 ]=2× [ 1005×502+1005 ]=2×1005×503

=2010×503

= 1011030

(5/9-5/6+1/4)÷(-1/36)=(5/9)×(-36)-(5/6)×(-36)+(1/4)×(-36)

=-20+30-9

=10-9

=1(-19 18/19)*38

=-1918×38÷19

=-1918×2

=-3836

(3/5+7/8)*40 11/3-5/7*14/15 5/6/(4/7/9/14) (5/8-1/10)*(5/9+1/3) 1/5/(1-1/2-1/3)

12楼:匿名用户

(3/5+7/8)x40

=3/5x40+7/8x40

=24+35

=5911/3-5/7x14/15

=11/3-2/3

=35/6÷(4/7÷9/14)

=5/6÷(4/7x14/9)

=5/6÷8/9

=5/6x9/8

=15/16

(5/8-1/10)x(5/9+1/3)

=21/40x8/9

=7/15

1/5÷(1-1/2-1/3)

=1/5÷1/6

=6/5

(3/4+1/2)÷5/8

=5/4x8/5

=223/14x27-9/14÷1/27

=27x(23/14-9/14)

=27x1

=2724x(3/4-7/12)

=24x3/4-24x7/12

=18-14

=4(2/3-4/9x3/8)÷7/16

=(2/3-1/6)x16/7

=1/2x16/7

=8/7

20÷5/9+3/8x4

=20x9/5+3/2

=36+3/2

=75/2

脱式计算(3/4+1/6)*2/3 25*1/5-5*1/5 6/11*7/15*10 (1/7+1/4)*28 (21+2/5)*5/7 39*7/13*2/3

13楼:匿名用户

(3/4+1/6)*2/3 =(9/12+2/12)x2/3=11/18

25*1/5-5*1/5 =5-1=4

6/11*7/15*10 =60/15x7/11=28/11(1/7+1/4)*28 =4+7=11

(21+2/5)*5/7 =15+2/7

39*7/13*2/3=14

60*2/5=12x2=24

4*2/9=8/9

3/10*2/3+1/4=1/5+1/4=9/2020*2/5-5/8 =8-5/8=6+3/82/9*8+2/9=2 /9x(8+1)=25/7*1/5*49 =1/7

48*1/12*5/6 =20/6=10/3

1/2*4+1/3*5+1/4*6+1/5*7+...+1/8*10+1/9*11(用简便方法计算)

14楼:新野旁观者

1/2*4+1/3*5+1/4*6+1/5*7+...+1/8*10+1/9*11

=(1/2-1/4+1/3-1/5+1/4-1/6+1/5-1/7+……+1/8-1/10+1/9-1/11)÷

2=(1/2+1/3-1/10-1/11)÷2=106/165÷2

=53/165

15楼:匿名用户

原式=(1/2)*(1/2-1/4+1/3-1/5+1/4-1/6.......+1/8-1/10+1/9-1/11)=(1/2)*(1/2+1/3-1/10-1/11) 应该是这样,就写到这了。。后面自己能搞定的把

16楼:墨梓暄丙麦

以上数为列求和

,每个数的分母都能写成n(n+2)即算式中每个数都可写作1/n(n+2)

其中n=2,3,4,5,6,7,8,9

因2/n(n+2)=(n+2-n)/(n(n+2))=(1/n)-(1/(n+2

))所以原式=(1/2-1/4+1/3-1/5+1/4-1/6+...+1/9-1/11)/2

=(1/2+1/3-1/10-1/11)/2=53/165

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