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
-605 6-11 15-7 ,(-60)÷(+5/6-11/15-7/12)
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