計算下面各題,能簡便計算的要簡便計算。2

2021-03-17 01:44:59 字數 4194 閱讀 4609

1樓:只剩相片

你這個中間卻符號啊, 2/5-1/6+2/3 ()1-1/4+2/5() 1/2+5/6-1/3() 8/9-5/9+1/6

如果是算四道題的話。

2/5-1/6+2/3 =2/5+(4/6-1/6)=2/5+1/2=7/10

1-1/4+2/5=3/4+2/5=23/20=1-0.25+0.4=1.15=23/20

8/9-5/9+1/6=(8/9-5/9)+1/6=1/3+1/6=1/2

這個真的沒有什麼很大的技巧性。

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

2樓:鞠翠花喻書

你這個中間卻符號啊,

2/5-1/6+2/3

()1-1/4+2/5()

1/2+5/6-1/3()

8/9-5/9+1/6

如果是算四道題的話。

2/5-1/6+2/3

=2/5+(4/6-1/6)=2/5+1/2=7/101-1/4+2/5=3/4+2/5=23/20=1-0.25+0.4=1.15=23/20

8/9-5/9+1/6=(8/9-5/9)+1/6=1/3+1/6=1/2

這個內真的沒有什麼很大的技巧性容。

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 = = = = = =

3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

計算下面各題,能簡便計算的用簡便方法計算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5

4樓:數學新綠洲

2-6/13÷9/26

= 2- (6/13)×(26/9)

=2- 4/3

=2/3

.(1/3+1/4)×36

=(1/3)×36 +(1/4)×36

=12+9

=21.

6/7×(4/5-2/3)÷1/5

=(6/7)×(4/5 - 2/3)×5

=(6/7)×(4 - 10/3)

=(6/7)×(2/3)

=4/7

.3/4-3/4×4/7+9/7

=(3/4)×(1- 4/7)+

9/7=(3/4)×(3/7)+9/7

=(1/4)×(9/7)+ 9/7

=(1/4 +1)×(9/7)

=(5/4)×(9/7)

=45/28

=1又17/28

計算下面各題(能簡便計算的要簡便計算)6.12+3/7+2.88+4/7

5樓:匿名使用者

(6.12+2.88)+(3/7+4/7)=9+1=10

6樓:匿名使用者

6.12十3/7十2.88+4/7

=6.12+2.88十(3/7十4/7)

=9+1=10

計算下面各題.(能簡便的要用簡便方法計算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0

7樓:手機使用者

(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3

=2.3+1.7

=4(2)21.6÷[64.8-(48.

6-2.7×2)]=21.6÷[64.

8-(48.6-5.4)]=21.

6÷[64.8-43.2]

=21.6÷21.6

=1(3)0.25×0.03×4

=(0.25×4)×0.03

=1×0.03

=0.03

0.13×3.89+0.13×5.11

=0.13×(3.89+5.11)

=0.13×9

=1.17

(5)10.1×87

=(10+0.1)×87

=10×87+0.1×87

=870+8.7

=878.7

用簡便方法計算下面各題: 3/9×8 3/9×2 6/5×2/15+2/15×4/5 36×(1

8樓:匿名使用者

用簡便方法計算下面各題:

3/9×8 +3/9×2

=3/9×(8+2)

=1/3×10

=10/3

6/5×2/15+2/15×4/5

=2/15×(6/5+4/5)

=2/15×2

=4/15

36×(

專1/3-5/18+7/12)

屬=36×1/3-36×5/18+36×7/12=12-10+21=23

計算下面各題能簡算的要簡算6/5-2/1+3/1

9樓:匿名使用者

6/5-2/1+3/1

5/6-1/2+1/3

=(5-3+2)/6

=4/6

=2/3

=3分之2

10樓:華山論劍

5/6-1/2+1/3=5/6-(3/6-2/6)=5/6-1/6=4/6=2/3

計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50

11樓:匿名使用者

(6/35+4/21)÷4/7

=6/35×7/4+4/21×7/4

=3/10+1/3

=9/30+10/30

=19/30

2/9÷2/7÷14/15

=2/9×7/2×15/14

=14/18×15/14

=5/6

(5/6-3/4)÷5/12+4/5

=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5

=2-13/5

=-3/5

3/10÷(4/5-1/2)

=3/10×5/4-3/10×2

=3/8-3/5

=15/40-24/40

=-9/40

2/25÷3/7+23/25÷3/7

=(2/25+23/25)÷3/7

=1×7/3

=2又1/3

8/9÷5/6+1/6

=8/9×6/5+1/6

=16/15+1/6

=32/30+5/30

=37/30

=1又7/30

2/3x=16

x=16×3/2

x=24

3/4x+1/4=3/8

3/4x=3/8-1/4

3/4x=1/8

x=1/8×4/3

x=1/6

1/5x-1/2=3/10

1/5x=1/2+3/10

1/5x=8/10

x=8/10×5x=4

12樓:**防騙

6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30

2/9x7/2x1/14=1/185/6

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