(35 - 17) - (-17 + 20 + 35)

=35-17+17-20-35

=35-35-17+17-20

=-20

\(\left(35-17\right)-\left(-17+20+35\right)\\ =18-\left(3+35\right)\\ =18-38\\ =-20\)

(35-17)-(-17+20+35)

=35-17+17-20-35

=(35-35)+[(-17)+17] -20

=-20

-50

-50

-50

a) 17.(15-16)+16.(17-20)

= 17 . 15 - 17.16 + 16.17 - 16.20

= 17 . 15 - 16.20

= 255 - 320

= -65

# HOK TỐT #

thanks

Trả lời :

17 . (15 - 16) + 16 . (17 - 20) = 17 . 15 - 17 . 16 + 16 . 17 - 16 . 20 = 17 . 15 - 16 . 20 = 255 - 320 = - 65

P/s : Phía cuối k chắc_

~Std well~

#Dương

20.(17-111)-17.(222+20)

=20.(-94)-17.242

=(-1880)-4114

=-5994

tick nha bạn

-20 + (-37)

= -(20 + 37)

= -57

Chọn B

`a) 465 + [ 58 + ( -465 ) + ( -38 ) ]`

`= 465 + 58 - 465 -38`

`= (465-465) + (58-38)`

`=0+ 20`

`=20`

`b) ( 35 - 17 ) + ( 17 + 20 - 35 )`

`= 35 -17 +17 +20-35`

`= (35-35) + (-17+17)+20`

`= 0 + 0 +20`

`=20`

$a)465+[58+(-465)+(-38)]$

=465+58−465−38$=465+58-465-38$

=(465−465)+(58−38)$=(465-465)+(58-38)$

=0+20$=0+20$

=20$=20$

�)(35−17)+(17+20−35)$b)(35-17)+(17+20-35)$

=35−17+17+20−35$=35-17+17+20-35$

=(35−35)+(−17+17)+20$=(35-35)+(-17+17)+20$

=0+0+20$=0+0+20$

=20$=20$

giúp mik đang vội :)

a. 19/17      b) 2

\(a)\dfrac{6}{17}+\dfrac{3}{17}\)

\(=\dfrac{6+13}{17}\)

\(=\dfrac{19}{17}\)

\(b)5\times\dfrac{8}{20}\)

\(=5\times\dfrac{2}{5}\)

\(=\dfrac{10}{5}\)

\(=2\)

_HT_

a) Ta có: \(17\cdot\left[29-\left(-111\right)\right]+29\cdot\left(-17\right)\)

\(=17\cdot\left[29+111-29\right]\)

\(=17\cdot111=1887\)

b) Ta có: \(19\cdot43+\left(-20\right)\cdot43-\left(-40\right)\)

\(=43\cdot\left(19-20\right)+40\)

\(=-43+40=-3\)

\(=\left(\dfrac{11}{10}+\dfrac{7}{10}+\dfrac{1}{10}\right)+\left(\dfrac{17}{20}+\dfrac{9}{20}+\dfrac{3}{20}\right)\\ =\dfrac{19}{10}+\dfrac{29}{20}=\dfrac{19\times2}{10\times2}+\dfrac{29}{20}=\dfrac{38}{20}+\dfrac{29}{20}\\ =\dfrac{47}{20}\)

\(H=\left(\dfrac{11}{10}+\dfrac{7}{10}+\dfrac{1}{10}\right)+\left(\dfrac{17}{20}+\dfrac{9}{20}+\dfrac{3}{20}\right)\)

\(H=\dfrac{19}{10}+\dfrac{29}{20}\)

\(H=\dfrac{67}{20}\)

\(H=\dfrac{11}{10}+\dfrac{17}{20}+\dfrac{7}{10}+\dfrac{9}{20}+\dfrac{1}{10}+\dfrac{3}{20}\\ \Rightarrow H=\left(\dfrac{11}{10}+\dfrac{7}{10}+\dfrac{1}{10}\right)+\left(\dfrac{17}{20}+\dfrac{9}{20}+\dfrac{3}{20}\right)\\ \Rightarrow H=\dfrac{19}{10}+\dfrac{29}{20}\\ \Rightarrow H=\dfrac{38}{20}+\dfrac{29}{20}\\ \Rightarrow H=\dfrac{67}{20}\)