0

0

\(\dfrac{-5}{10}+\dfrac{12}{28}-\dfrac{3}{27}-\dfrac{7}{18}+\dfrac{20}{35}\\ =\left(\dfrac{-1}{2}-\dfrac{1}{9}-\dfrac{7}{18}\right)+\left(\dfrac{3}{7}+\dfrac{4}{7}\right)\\ =\left(\dfrac{-9}{18}-\dfrac{2}{18}-\dfrac{7}{18}\right)+\dfrac{7}{7}\\ =\dfrac{-18}{18}+1\\ =\left(-1\right)+1\\ =0\)

   \(\dfrac{-4}{13}.\dfrac{5}{17}+\dfrac{-12}{13}.\dfrac{4}{17}\)

= \(\dfrac{-4}{13}.\dfrac{5}{17}+\dfrac{-4}{13}.\dfrac{12}{17}\)

= \(\dfrac{-4}{13}.\left(\dfrac{5}{17}+\dfrac{12}{17}\right)\)

= \(\dfrac{-4}{13}.\dfrac{17}{17}\)

= \(\dfrac{-4}{13}.1\)

= \(\dfrac{-4}{13}\)

= \(\dfrac{-4.5-12.4}{13.17}\)

=\(\dfrac{-4\left(5+12\right)}{13.17}\)

=\(\dfrac{-4.17}{13.17}\)

=\(\dfrac{-4}{13}\)

=337+829+145-829-337=145

=337+829+145-829-337

=145

Bài 3:

a: \(=\left(-47+47\right)+\left(200-400\right)=-200\)

b: \(=\left(-2\right)+\left(-2\right)+\left(-2\right)=-6\)

c: \(=25\left(-19-81\right)=25\cdot\left(-100\right)=-2500\)

d: \(=17\cdot28-17\cdot32-28\cdot17+28\cdot32=32\cdot11=352\)

e: \(=12-57+57-12=0\)

= 2017 + 185 - ( -815 ) - 2017 + 6500

= 185 - ( - 815) + 6500

= 7500

14.389 nha

=24.210+210.76

=(24+76).210

=100.210

=21000

ok e nha

\(\dfrac{-5}{7}\cdot\dfrac{3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+1\dfrac{5}{7}=\dfrac{5}{7}\cdot\dfrac{-3}{13}-\dfrac{5}{7}\cdot\dfrac{10}{13}+\dfrac{12}{7}\cdot1=\dfrac{5}{7}\cdot\left(\dfrac{-3}{13}-\dfrac{10}{13}\right)+\dfrac{12}{7}=\dfrac{5}{7}-1+\dfrac{12}{7}=-\dfrac{5}{7}+\dfrac{12}{7}=\dfrac{7}{7}=1\)

=-5/7(3/13+10/13)+12/7

=-5/7+12/7=1

tich mik mik tich lai cho!

1945

-3 + 7 -9-54 + 3 +50 +13

= (-3+3)+ (13 -9)+ 7 + 54 - 50

= 0 + 4 + 7 + 54 - 50

 =0 + 7 + 54 - ( 50 +4 )

= 0 + 7 + 54 - 54

= 7 + 0 

=7