7+2 6-3 8

2020-12-09 17:42:29 字数 6741 阅读 9240

1楼:妙酒

4/9×2/7+2/7

=2/7x(4/9+1)

=2/7x13/9

=26/63

1/6-3/8×1/6

=1/6x(1-3/8)

=1/6x5/8

=5/48

1/9-6/7×1/9

=1/9x(1-6/7)

=1/9x1/7

=1/63

2楼:比蜜甜甜

4/9×2/7+2/7

=2/7x(1+4/9)

=26/63

1/6-3/8×1/6

=1/6(1-3/8)

=5/48

1/9-6/7×1/9

=1/9(1-6/7)

=1/63

(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)=

3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

4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

5楼:匿名用户

热,通分不行吗!!!!

要简便算法,过程 1:8/9×(9+3/4)-2/3 2:7/8÷2/3+7/8×1/2 3:4-2/5÷8/15-1/4

6楼:

1:8/9×(

9+3/4)-2/3=8/9×9+8/9×3/4-2/3=8+2/3-2/3=8 2:7/8÷2/3+7/8×1/2=7/8×3/2+7/8×1/2=7/8×(3/2+1/2)=7/8×2=7/4 3:4-2/5÷8/15-1/4=4-2/5×15/8-1/4=4-3/4-1/4=4-(3/4+1/4)=4-1=3 4:

7/8+2/3÷4/5+1/6=7/8+2/3×5/4+1/6=7/8+5/6+1/6=7/8+1=15/8 5: 6-5/12×9/10-13/8 =6-3/8-13/8=6-(3/8+13/8)=6-2=4 6: 4/5+5/8÷1/4+1/2=4/5+5/8×4+1/2=4/5+5/2+1/2=4/5+3=19/5 7:

2-8/9×3/4-1/3=2-2/3-1/3=2-(2/3+1/3)=2-1=1 10: 4/9+2/7+5/18÷1/2=4/9+2/7+5/18×2=4/9+2/7+5/9=4/9+5/9+2/7=1+2/7=9/7 11:4-8/15÷2/3-1/5=4-8/15×3/2-1/5=4-4/5-1/5=4-(4/5+1/5)=4-1=3 口算的,你回去检验下吧

7楼:匿名用户

8/9×(9+3/4)-2/32=8/9*9+8/9*3/4-1/16=8+(2/3-1/16)=8又29/48

8楼:匿名用户

7/8+2/3*5/4+1/6=7/8+5/6+1/6=15/8

9楼:含黙兮攸语

我x,这个还要简便方法。我砸觉得直接算就是最简便的、。、、

6/5-4/2= 3/2-2/1= 4/1+3/2= 5/3-3/1= 8/4-6/1= 3/5-4/3= 6/2+3/1= 9/5-2/1= 7/2+3/1= 5/2-6/2= 4/2+2/1= 8

10楼:匿名用户

6/5-4/2=12/4=3/1

3/2-2/1= 6/4-6/3=6/1

4/1+3/2= 12/3+12/8=12/115/3-3/1=15/9-15/5=15/48/4-6/1= 24/12-24/4=24/8=3/13/5-4/3=12/20-12/9=12/116/2+3/1=3/1+3/1=3/2

9/5-2/1=18/10-18/9=18/17/2+3/1=21/6+21/7=21/135/2-6/2= 30/12-30/10=30/2=15/14/2+2/1=2/1+2/1=1

1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10用简便方法怎么算?

11楼:枫叶

=(1+20)×10

=21×10

=210

你好,本题已解答,如果满意,请点右上角“采纳答案”。

12楼:匿名用户

拆分每个分数。记住等式:

1/(x(x+1))=1/x-1/(x+1)

所以,原等式就可以简化为1/1-1/10=0.9

13楼:柳树湾笑声

=(1-1/2)+(1/2-1/3)+(1/3-1/4)+... +(1/8-1/9)+(1/9-1/10)

=1-1/10=9/10

(5/6-3/4)÷(2/3+4/9) (1-1/6×2/5)÷7/9

14楼:新野旁观者

(5/6-3/4)÷(2/3+4/9)

=1/12÷10/9

=3/40

(1-1/6×2/5)÷7/9

=(1-1/15)÷7/9

=14/15÷7/9

=6/5

(5/9+1/13)×9+4/13

=5/9×9+1/13×9+4/13

=5+(9/13+4/13)

=5+1

=65/4-(3/4-1/8)-3/8

=(5/4-3/4)-(3/8-1/8)

=1/2-1/4

=1/4

15楼:kz菜鸟无敌

(5/6-3/4)÷(2/3+4/9)

= (10/12-9/12)÷(6/9+4/9)=1/12÷10/9

=1/12 x 9/10

=3/40

~~~~~~ (1-1/6×2/5)÷7/9=(1-1/15) ÷ 7/9

=14/15 x 9/7

=6/5

~~~~~

(5/9+1/13)×9+4/13

=5/9 x 9 + 1/13 x 9 +4/13=5 + 9/13 + 4/13

=5 + 1

=6~~~~~

5/4-(3/4-1/8)-3/8

=5/4 - ( 6/8 - 1/8 ) - 3/8=5/4 - 5/8 -3/8

=5/4 - 1

=1/4

写个程序,求1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10...

16楼:栖霞夕阳

注意:1/2是0,1.0/2结果才是0.5。同样-1/4,1/5都是0,希望可以帮到你。

17楼:牙刷的悲伤

因为你设置的1/2等用的都是整形变量,当然结果等于0,你把后面的变量改成float就行了。

计算脱式 (5/6-1/4*2/3)÷1/6 (3/8-1/4)÷(8/9*3/4) 18/35÷0.6*2/3 7/8*【1÷(7/10-7/20)】 下面

18楼:匿名用户

(5/6-1/4*2/3)

÷1/6

=(5/6-1/6)

=5/6×6/1-1/6×6/1

=5-1

=4(3/8-1/4)÷(8/9*3/4)=(3/8-1/4)÷2/3

=3/8×3/2-1/4×3/2

=9/16-3/8

=9/16-6/16

=3/16

或=(3/8-1/4)÷2/3

=1/8×3/2

=3/16

18/35÷0.6*2/3

=18/35÷3/5×2/3

=18/35×5/2

=9/7

7/8*【1÷(7/10-7/20)】

=7/8×[1÷7/20]

=7/8×[1×20/7]

=7/8×20/7

=5/2

4.67-(2.98+0.67)

=4.67-2.98-0.67

=4-2.98

=4-(3-0.02)

=4-3+0.02

=1.02

7.85*99+7.85

=7.85(99+1)

=7.85×100

=785

(51+34/39)*2/17

=51*2/17+34/39*2/17

=3*2+4/39

=6+4/39

=6又4/39

7.5*0.4*25*0.8

=25*0.3*0.4*25*0.2*4

=25*4*25*0.4*0.3*0.2

=100*10*0.06

=60102*7.8

=(100+2)*7.8

=780+15.6

=795.6

14.28÷3.5÷2

=14.28÷(3.5*2)

=14.28÷7

=2.04

2/3*1/15+14/15*2/3

=2/3(1/15+14/15)

=2/3×1

=2/3

97*97/98

=97×(1-1/98)

=97-97/98

=96又1/98

19楼:我不是他舅

(5/6-1/4*2/3)÷1/6

=(5/6-1/6)×

6=4/6×6

=4(3/8-1/4)÷(8/9*3/4)=1/8÷2/3

=1/8×3/2

=3/16

18/35÷0.6*2/3

=18/35×5/3×2/3

=6/7×2/3

=4/7

7/8*【1÷(7/10-7/20)】

=7/8×1÷7/20

=7/8×20/7

=5/2

4.67-(2.98+0.67)

=4.67-0.67-2.98

=4-2.98

=1.02

7.85*99+7.85

=7.85×(99+1)

=7.85×100

=785

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