1)-73

2)-5

3)-64

4)-56

5)9

6)-20

7)6

8)-2

Tick nha

mk ra kết quả thôi nha

đăng tùng câu  một thui bạn 

bạn làm thế chắc tụi mk xỉu gần hết 

\(-\dfrac{3}{16}+-\dfrac{3}{8}-\dfrac{5}{4}\)

\(=-\dfrac{3}{16}-\dfrac{3}{8}-\dfrac{5}{4}\)

\(=-\dfrac{3}{16}-\dfrac{6}{16}-\dfrac{20}{16}\)

\(=\dfrac{-3-6-20}{16}\)

\(=-\dfrac{29}{16}\)

\(\left(-\dfrac{25}{13}\right)+\dfrac{-9}{17}+\dfrac{12}{13}+\dfrac{25}{17}\)

\(=\left[\left(-\dfrac{25}{13}\right)+\dfrac{12}{13}\right]+\left[\left(-\dfrac{9}{17}+\dfrac{25}{17}\right)\right]\)

\(=-\dfrac{13}{13}+\dfrac{17}{17}\)

\(=-1+1\)

\(=0\)

giúp với

\(\dfrac{4}{7}+\dfrac{46}{13}+\dfrac{25}{8}+\dfrac{3}{7}-\dfrac{1}{8}-\dfrac{7}{13}\)

\(=\left(\dfrac{4}{7}+\dfrac{3}{7}\right)+\left(\dfrac{46}{13}-\dfrac{7}{13}\right)+\left(\dfrac{25}{8}-\dfrac{1}{8}\right)\)

\(=1+3+3=7\)

-3/8+12/25+5/-8+2/-5+13/25

=(3/8+5/-8)+12/25+2/-5+13/25

=-1+12/25+2/-5+13/25

=-13/25+2/-5+13/25

=-23/25+13/25

=-2/5

\(\dfrac{-3}{8}+\dfrac{12}{25}+\dfrac{5}{-8}+\dfrac{2}{-5}+\dfrac{13}{25}\)

\(=\dfrac{-3}{8}+\dfrac{12}{25}+\dfrac{-5}{8}+\dfrac{-2}{5}+\dfrac{12}{25}\)

\(=\left(\dfrac{-3}{8}+\dfrac{-5}{8}\right)+\left(\dfrac{12}{25}+\dfrac{12}{25}+-\dfrac{2}{5}\right)\)

Còn lại bn tự tính nhé!

\(\dfrac{-3}{8}\) + \(\dfrac{12}{25}\) + \(\dfrac{5}{-8}\) + \(\dfrac{2}{-5}+\dfrac{13}{25}\)

= \(\left(\dfrac{-3}{8}+\dfrac{5}{-8}\right)+\left(\dfrac{12}{25}+\dfrac{13}{25}\right)+\dfrac{2}{-5}\)

= \(\left(\dfrac{-3}{8}+\dfrac{-5}{8}\right)+1+\dfrac{-2}{5}\)

= 1 + 1 + \(\dfrac{-2}{5}\)

= \(\dfrac{8}{5}\)

Ta chuyển tất cả những ph/số có MS là số âm thành số dương.

Ta có : -3/8 + 12/25 + -5/8 + -2/5 + 13/25

= (-3/8 + -5/8) + ( 12/25 + 13/25) + -2/5

= -8/8 + 25/25 + -2/5

= -1 + 1 + -2/5

= 0 + -2/5

= -2/5

\(\left(\dfrac{10}{17}+\dfrac{7}{17}\right)-\left(\dfrac{5}{13}-\dfrac{-8}{13}\right)-\dfrac{11}{25}\)

\(=1-1-\dfrac{11}{25}\)

\(=0-\dfrac{11}{25}\)

\(=\dfrac{-11}{25}\)

13*(-7)=-91

(-8)*(-25)=200

Học tốt

13 . (-7) = -91

(-8) . (-25) = 200

25 . (-47) . (-4) = 4700

8. (125 - 3000) = 8. (-2875) = -23000

Hok tốt !

3/5+47/13-25/8+1/8-8/13+2/5 = 1 nhé!

     =>( \(\frac{3}{5}\)+ \(\frac{2}{5}\)) +  (\(\frac{47}{13}\)- \(\frac{8}{13}\)) - (\(\frac{25}{8}\)+ \(\frac{1}{8}\))

       => 1 + 3 - \(\frac{26}{8}\)

      => 4 - \(\frac{26}{8}\)

      => \(\frac{4}{1}\)- \(\frac{26}{8}\)

      => \(\frac{32-26}{8}\)

      => \(\frac{6}{8}\)

      => \(\frac{3}{4}\)

1. 25 + (-8) + (-25) + (-2)

= [ 25 + (-25) ] + [ (-8) + (-2) ]

= 0 + (-10)

= -10

2. (-23) + 13 + (-17) + 57

= [ (-23) + (-17) ] + ( 13 + 57 )

= (-40) + 70

= 30

25+(-8)+(-25)+(-2)=-10

-23+13+(-17)+57= 30

\(1.25+\left(-8\right)+\left(-25\right)+\left(-2\right)\)

\(=\left[25+\left(-25\right)\right]+\left[\left(-8\right)+\left(-2\right)\right]\)

\(=0+\left(-10\right)\)

\(=-10\)

_________________________________
\(2.\left(-23\right)+13+\left(-17\right)+57\)

\(=\left(-23+13\right)+\left(-17+57\right)\)

\(=-10+40\)

\(=30\)

`@` `\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`