能簡便的就簡便計算5 6 1 15 1 12 1(3 5 13 8 13)4 6 (

2021-05-19 16:07:38 字數 3886 閱讀 1960

1樓:匿名使用者

5/7+5/6+2/7+1/6=(5/7+2/7)+(5/6+1/6)=1+1=2

1/15*(1/3+1/12)=1/15(4/12+1/12)=1/15*5/12=1/36

1/4/(3-5/13-8/13)=1/4/(3-1)=1/4/2=1/8

4/9/【5/6-(1/6+1/3)】=4/9/(5/6-1/6-1/3)=4/9/(4/6-1/3)=4/9/(1/3)=4/3

其實你應當自己做,不會就應努力學,不學永遠不會。

2樓:surfer男孩

5/7+5/6+2/7+1/6= 5/7+2/7+5/6+1/6=1+1=2

1/15*(1/3+1/12) =1/15*(4/12+1/12)=1/15*5/12=1/36

1/4/(3-5/13-8/13)=1/4/[3-(5/13+8+13)]=1/4/[3-1]=1/8

4/9/【5/6-(1/6+1/3)】=4/9[5/6-1/6-1/3]=4/9/1/3=4/3

下面各題怎樣簡便就怎樣算 (1)5/7+5/6+2/7+1/6 (2)1/15乘以(1/3+1/1

3樓:匿名使用者

(1)5/7+5/6+2/7+1/6

=5/7+2/7+5/6+1/6=2

(2)1/15x(1/3+1/12)=1/15x5/12=1/36(3)1/3+3除以1/2

(4)3.7乘以6/5+1.3除以5/6

(5)1/4除以3-5/13-8/13)

(6)0.5乘以(3/5+6/25)

4樓:

(1)原

式=(5/7+2/7)+(5/6+1/6)=1+1=2;

(2)原式=1/15*5/12=1/36;

(3)原式=1/3+3*2=19/3;

(4)原式=37/10*6/5+13/10*6/5=(37/10+13/10)*6/5=5*6/5=6;

(5)原式=1/12-5/13-8/13=1/12-(5/13+8/13)=1/12-1=-11/12;

(6)原式=1/2*(15/25+6/25)=1/2*21/25=21/50。

3/7+1/2-3/7簡便計算5/7-1/6+5/14簡便計算7/12-(5/6-5/12)簡便計算2/3-1/2-1/18 5

5樓:淨壇使者

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

6樓:匿名使用者

真是閒的蛋疼,這題就是寫出來消磨時間的!

計算下面各題,能簡便計算的要簡便計算。 3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4 = = = = = =

7樓:吃葷的兔子

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

下面各題怎樣簡便怎樣 算 (1)7/5+6/5+7/2+6/1 (2)15/1(3/1+12/

8樓:匿名使用者

=13/5+7/2+6

=12又1/10

(1/15+1/21)×105 45÷5/7÷7/8 8/13÷7-1/7×6/13 1/5×5/8-1/5÷8/3 3/5÷5/8+2/5÷5/8簡便運算

9樓:叫啥知不道

(1/15+1/21)×105

=(1/15)

*(15*7)+(1/21)*(21*5)=7+5

=1245÷5/7÷7/8

=5*9*(7/5)*(8/7)

=9*8

=728/13÷7-1/7×6/13

=8/13*(1/7)-6/13*(1/7)=(8/13-6/13)*(1/7)

=2/13*1/7

=2/91

1/5×5/8-1/5÷8/3

=1/5*5/8-1/5*3/8

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

=1/5*1/4

=1/20

3/5÷5/8+2/5÷5/8

=(3/5+2/5)*(8/5)

=1*8/5

=8/5

x-1/2x=5/8

1/2x=5/8

x=5/8*2

x=5/4

4/5x÷2=7/16

4/5x=7/16*2

x=7/8*5/4

x=35/32

1/4x+1/3x=5/18

7/12x=5/18

x=5/18*12/7

x=10/21

1/8x÷3/10=5/18

1/8x=5/18*3/10

x=1/12*8

x=2/3

4/5x-3/4x=25

(16/20-15/20)*x=25

x=25/(1/20)

x=500

10樓:匿名使用者

(1/15+1/21)×105=7+5=12

45÷5/7÷7/8 =45*7/5*8/7 =45*8/5=72

8/13÷7-1/7×6/13 =(8-6)/(13*7)=2/91

1/5×5/8-1/5÷8/3=5/40-3/40=2/40=1/20

3/5÷5/8+2/5÷5/8=(3/5+2/5)÷5/8 =8/5

x-1/2x=5/8 , x=5/4

4/5x÷2=7/16 , 2/5 x= 7/16, x=35/32

1/4x+1/3x=5/18 , 7/12 x = 5/18, x=10/21

1/8x÷3/10=5/18 , 1/8 x =5/18*3/10, x=2/3

4/5x-3/4x=25, (16-15)/20 x =25, x=500

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