ai điên thì giải đi

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lấy máy tính mà tính

B

D

C

a: =9/12+8/12=17/12

b: =15/24+14/24=29/24

c: =4/25+15/25=19/25

a 3/4+8/12  =9/12+8/12=17/12

  b 5/8 +14/24=15/24+14/24=29/24

     c 4/25+3/5   =4/25+15/25=19/25

a: =9/12+8/12=17/12

b: =15/24+14/24=29/24

c: =4/25+15/25=19/25

2/3 + 7/1 = 2/3 + 7 = 2/3 + 21/3 = 23/3

25/48 + 11/24 = 25/48 + 22/48 = 47/48

5/7 + 3/8 = 40/56 + 21/56 = 61/56

15/24 + 12/6 = 5/8 + 2 = 5/8 + 16/8 = 21/8

5/6 + 4/3 = 5/6 + 8/6 = 13/6

3/8 + 7/12 = 9/24 + 14/24 = 23/24

= 23/3

= 47/48

=61/56

=21/8

=13/6

= 23/24

Cảm ơn mn nhìu nhaaaaaa

`@` `\text {Ans}`

`\downarrow`

`1,`

`a)`

`-7/25 + (-8)/25`

`= (-7 - 8)/25`

`= -15/25`

`= -3/5`

`b)`

`6/13 + (-15)/39`

`= 18/39 + (-15)/39`

`= (18 - 15)/39`

`= 3/39`

`= 1/13`

`c)`

`5/7 + 4/(-14)`

`= 10/14 + (-4)/14`

`= (10 - 4)/14`

`= 6/14`

`= 3/7`

`d)`

`-8/18 + (-15)/27`

`= -4/9 + (-5)/9`

`= (-4-5)/9`

`= -9/9 = -1`

`2,`

`a)`

`3/5 + (-7)/4`

`= 12/20 + (-35)/20`

`= (12 - 35)/20`

`=-23/20`

`b)`

`(-2) + (-5)/8`

`= (-16)/8 + (-5)/8`

`= (-16 - 5)/8`

`= -21/8`

`c)`

`1/8 + (-5)/9`

`= 9/72 + (-40)/72`

`= (9-40)/72`

`= -31/72`

`d)`

`6/13 + (-14)/39`

`= 18/39 + (-14)/39`

`= (18 - 14)/39`

`= 4/39`

`e)`

`(-18)/24 + 15/21`

`= (-3)/4 + 5/7`

`= (-21)/28 + 20/28`

`= (-21 + 20)/28`

`= -1/28`

\(\dfrac{5}{8}:3\times\dfrac{24}{25}=\dfrac{5}{8}\times3\times\dfrac{24}{25}=1\times1\times\dfrac{1}{5}=\dfrac{1}{5}\)

\(=\dfrac{5}{8}\times\dfrac{1}{3}\times\dfrac{24}{25}\)

\(=\dfrac{5\times1\times24}{8\times3\times25}\)

\(=\dfrac{5\times1\times8\times3}{8\times3\times5\times5}=\dfrac{1}{5}\)

58:3×2425=58×3×2425=1×1×15=15

1: \(=\dfrac{-5}{8}\cdot\dfrac{15}{4}=-\dfrac{75}{32}\)

2: \(=\dfrac{15}{17}\cdot\dfrac{25}{34}=\dfrac{375}{578}\)

3: \(=-12\cdot\dfrac{8}{3}=-4\cdot8=-32\)

4: \(=\dfrac{15}{14}\cdot\dfrac{20}{21}=\dfrac{50}{49}\)

5: \(=48\cdot\dfrac{24}{5}=230.4\)

6/5 = 30/25

8/7 = 24/21

25/45 = 5/9

56/24 = 7/3

Chúc bạn học tốt.

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