计算(能简算的要简算)5 7-(2 5)+

2020-12-03 21:37:55 字数 4311 阅读 8871

1楼:匿名用户

5/7-(2/3-2/5)+3/2

=5/7-4/15+3/2

=150/210-56/210+315/210=409/210

=225/210+56/210

=281/210

3/5+4/7-2/5+3/7递等式计算能简算的要简算

2楼:龚成素

分母相同的分组

3/5+4/7—2/5+3/7

=3/5—2/5+4/7+3/7

=1/5+1

=1又1/5

3楼:匿名用户

脱式计算3/5-2/5+(4/7+3/7),

等于1/5+1=1又1/5,

就是这样算的

4楼:匿名用户

原式=4/7+3/7+(3/5-2/5)

=1又1/5.

计算下面各题,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 2 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6

5楼:紫色学习

1/2+4/7+3/7

=1/2+1

=1又1/2

1/9+(1/6+2/9)+5/6

=(1/9+2/9)+(1/6+5/6)

=1/3+1

=1又1/3

苹果数减去3后是4和6的公倍数。4、6的最小公倍数是24所以苹果数最少是24+3=27(个)

计算下面各题,能简算的要简算1/2+4/7+3/7 1/10+3/8-2/5 1-(2/3+1/8) 7/8-(2/3-1/4) 1/9+(1/6+2/9)+5/6

6楼:新野旁观者

计算下面各题,能简算的要简算

1/2+4/7+3/7

=1/2+(4/7+3/7)

=1/2+1

=1又1/2

1/10+3/8-2/5

=19/40-2/5

=3/40

1-(2/3+1/8)

=1-2/3-1/8

=1/3-1/8

=5/24

7/8-(2/3-1/4)

=7/8+1/4-2/3

=9/8-2/3

=11/24

1/9+(1/6+2/9)+5/6

=(1/9+2/9)+(1/6+5/6)

=1/3+1

=1又1/3

计算下面各题,能简便计算的要简便计算。 3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4 = = = = = =

7楼:吃荤的兔子

3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4

=36/60+45/60-50/60 =8/9+1 =15/8-1

=31/60 =17/9 =7/8

9/7-1/6+3/7 7/4-12/23-3/4 5-6(3/8+1/6)

= 12/7-1/6 = 1-12/23 =5-(9/4+1)

= 72/42-7/42 =11/23 =7/4

=65/42

能简算的简算:1、6又2/3-(5/7+5又2/3)

8楼:妙酒

您好:6又2/3-(5/7+5又2/3)

=6又2/3-5又2/3-5/7

=1-5/7

=2/7

9又4/12-6又13/27-1又14/27=9又1/3-(6又13/27+1又14/27)=9又1/3-8

=1又1/3

如果本题有什么不明白可以追问,如果满意记得采纳如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢谢。

祝学习进步!

能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14

9楼:

1) =(3/20)*(10/7)=3/142) =(6/9-2/9)*(21/20)=(4/9)*(21/20)=7/15

3) =1-(5/14)*(7/5)=1-1/2=1/24) =(1/4)*(4/5)/(7/6)=(1/5)*(6/7)=6/35

10楼:匿名用户

(3/4-3/5)÷7/10

=(15/20-12/20)x10/7

=3/20 x 10/7

=3/14

(2/3+2/9)÷20/21

=(6/9+2/9)x21/20

=8/9 x 21/20

=2/3 x 7/5

=14/15

1-5/14÷5/7

=1-5/14 x 7/5

=1-1/2

=1/2

1/4÷(2/3+1/2)×4/5

=1/4÷7/6 x 4/5

=6/28 x 4/5

=6/35

3/7+1/2-3/7简便计算5/7-1/6+5/14简便计算7/12-(5/6-5/12)简便计算2/3-1/2-1/18 5

11楼:匿名用户

3/7+1/2-3/7简便计算

=(3/7-3/7)+1/2

=1/2;

5/7-1/6+5/14简便计算7

=(10/14+5/14)-1/6

=15/14-1/6

=90/84-14/84

=76/84;

=19/21;

7/12-(5/6-5/12)简便计算

=(7/12+5/12)-5/6

=1-5/6

=1/6;

2/3-1/2-1/18

=12/18-9/18-1/18

=2/18

=1/9;

2x-1/8=7/8

2x=1;

x=1/2;

x-1/9-8/9=2 解方程

x-1=2;

x=3;

您好,很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,如果满意记得采纳如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢谢。

祝学习进步

12楼:净坛使者

3/7 + 1/2 - 3/7

= 3/7 - 3/7 + 1/2

= 1/2

5/7 - 1/6 + 5/14

= 10/14 + 5/14 - 1/6

= 1 + 1/14 - 1 + 5/6

= 3/42 + 35/42

= 38/42

= 19/21

7/12 - ( 5/6 - 5/12 )= 7/12 - 5/6 + 5/12

= 1 - 5/6

= 1/6

2/3 - 1/2 - 1/18

= 12/18 - 9/18 - 1/18= 2/18

= 1/9

2x - 1/8 = 7/8

2x = 7/8 + 1/8

2x = 1

x = 1/2

x - 1/9 - 8/9 = 2

x - 1 = 2

x = 2 + 1

x = 3

13楼:匿名用户

真是闲的蛋疼,这题就是写出来消磨时间的!

1、计算下面各题。(能简算的要简算)15×(3/2+5/3) 〖6/5-(8/1+12/5)〗×7/3

14楼:乐为人师

15×(2/3+3/5)

= 15×2/3+15×3/5

=10+9

=19〖5/6-(1/8+5/12)〗×3/7=[5/6-13/24]×3/7

=7/24×3/7

=1/8

脱式计算:能简算的要简算。,脱式计算:一、能简算的要简算。③4/7×5/9+3/7×5/9 = = = =

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