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19 tháng 1

a; \(\dfrac{4}{5}\) \(\times\) \(\dfrac{11}{\dfrac{-4}{5}\times\dfrac{1}{7}}\) = \(\dfrac{-11}{\dfrac{1}{7}}\) = -77

10 tháng 5 2018

\(-\frac{3}{5}.\frac{11}{7}+\frac{3}{-5}.\frac{4}{7}+\frac{23}{7}\)

\(=\frac{-3}{5}\left(\frac{11}{7}+\frac{4}{7}\right)+\frac{23}{7}\)

\(=\frac{-3}{5}.\frac{15}{7}+\frac{23}{7}\)

\(=\frac{-9}{7}+\frac{23}{7}=2\)

4 tháng 4 2018

= -5 / 7 x ( 2 / 11 + 9 / 11) + 12/7

= -5/7 x 1 + 12/7

= -5/7 + 12/7

= 1

b, = ( 9/4 x 105 - 9/4 x 101) : 3/2 - 64 x ( 1/4 - 3/4)

  =  [ 9/4 x ( 105 - 101)] : 3/2 -64 x -1/2

= 9/4 x 4 : 3 /2 - (-32)

= 9 : 3/2 + 32

= 18/3 +32

20 tháng 1 2023

a)

\(11\dfrac{3}{13}-\left(2\dfrac{4}{7}+5\dfrac{3}{13}\right)\)

\(=\dfrac{146}{13}-\left(\dfrac{18}{7}+\dfrac{68}{13}\right)\)

\(=\dfrac{146}{13}-\dfrac{18}{7}-\dfrac{68}{13}\)

\(=\left(\dfrac{146}{13}-\dfrac{68}{13}\right)-\dfrac{18}{7}\)

\(=6-\dfrac{18}{7}\)

\(=\dfrac{24}{7}\)

b)

\(\dfrac{2}{7}\times5\dfrac{1}{4}-\dfrac{2}{7}\times3\dfrac{1}{4}\)

\(=\dfrac{2}{7}\times\dfrac{21}{4}-\dfrac{2}{7}\times\dfrac{13}{4}\)

\(=\dfrac{2}{7}\times\left(\dfrac{21}{4}-\dfrac{13}{4}\right)\)

\(=\dfrac{2}{7}\times2\)

\(=\dfrac{4}{7}\)

20 tháng 1 2023

\(a,11\dfrac{3}{13}-\left(2\dfrac{4}{7}+5\dfrac{3}{13}\right)\)

\(=\dfrac{146}{13}-\left(\dfrac{18}{7}+\dfrac{68}{13}\right)\)

\(=\dfrac{146}{13}-\dfrac{68}{13}-\dfrac{18}{7}\)

\(=6-\dfrac{18}{7}\)

\(=\dfrac{24}{7}\)

\(b,\dfrac{2}{7}\times5\dfrac{1}{4}-\dfrac{2}{7}\times3\dfrac{1}{4}\)

\(=\dfrac{2}{7}\times\dfrac{21}{4}-\dfrac{2}{7}\times\dfrac{13}{4}\)

\(=\dfrac{2}{7}\times\left(\dfrac{21}{4}-\dfrac{13}{4}\right)\)

\(=\dfrac{2}{7}\times2\)

\(=\dfrac{4}{7}\)

25 tháng 3 2018
1/7-8/7:5:3/4(-2) mũ 2 1/7-8/7:23/4*(-4) 1/7-8/7..k bik lm nx
2 tháng 5 2021

6/7+(5/8-3/16):5.-4

=6/7+(10/16-3/16):5.-4

=6/7+7/16:5.-4

=6/7+7/80.-4

=6/7+-28/80

=6/7+7/20

120/140+49/140

=169/140

2 tháng 5 2021

Thanks ạ!

6 tháng 5 2018

\(-\frac{5}{7}.\frac{68}{11}+\frac{-5}{7}.\frac{86}{11}+\frac{12}{7}\\ =-\frac{5}{7}.\left(\frac{68}{11}+\frac{86}{11}\right)+\frac{12}{7}\\ =-\frac{5}{7}.\frac{154}{11}+\frac{12}{7}\\ =-\frac{5}{7}.14+\frac{12}{7}\)

\(=-10+\frac{12}{7}\\ =-\frac{70}{10}+\frac{12}{7}=-\frac{58}{7}\)

6 tháng 5 2018

-5/7.68/11+-5/7.86/11+12/7

=-5/7.(68/11-86/11)+12/7

=-5/7.-18/11+12/7

=90/77+12/7

=90/77+132/77

=222/77

28 tháng 2 2023

`a)3/5+(-4/9)`

`=3/5-4/9`

`=27/45-20/45`

`=7/45`

`b)3/5+2/5 . 15/8`

`=3/5 + 30/40`

`=3/5+3/4`

`=12/20+15/20`

`=27/20`

`c)7/2 . 8/13 + 8/13 . (-5/2)`

`=8/13 . (7/2 +(-5)/2)`

`=8/13 . 1`

`=8/13`

`d)-5/17 . (-9/23)+9/23 . (-22/17) + 11 9/23`

`=-5/17 . (-9/23) + 9/23 . (-1) . 22/17 + 11 + 9/23`

`=-5/17 . (-9/23) + (-9/23) . 22/17+11+9/23`

`= -9/23 ( -5/17 + 22/17)+11+9/23`

`= - 9/23 . 1+11+9/23`

`=-9/23+11+9/23`

`=(-9/23+9/23)+11`

`=0+11`

`=11`

a: =27/45-20/45=7/45

b: =3/5+30/40

=3/5+3/4

=12/20+15/20

=27/20

c: =8/13(7/2-5/2+1)=8/13*2=16/13

d: =9/23*5/17-9/23*22/17+11+9/23

=-9/23+11+9/23

=11