234456

-

  123798

________

   110658

ĐÂY NHÉ !!! ĐÚNG CHO MK LIKE NHEN !!!

a ) 17 2 31 − 15 17 + 6 2 31 = 17 2 31 − 6 2 31 − 15 17 = 11 − 15 17 = 10 2 17 .

b ) 31 6 13 + 5 9 41 − 36 6 13 = 31 6 13 − 36 6 13 + 5 9 41 = − 5 + 5 9 41 = 9 41 .

a ) 27 51 59 − 7 51 59 − 1 3 = 27 51 59 − 7 51 59 + 1 3 = 20 1 3

b ) 17 29 31 − 3 7 8 − 2 28 31 − 4 . = 17 29 31 − 2 28 31 − 3 7 8 + 4 = 15 1 31 + 1 8 = 15 39 248 .

a )   5 4 9 − 9 7 12 − 4 5 9 = 5 4 9 + 4 5 9 − 9 7 12 = 10 − 9 7 12 = 5 12 .

b ) 8 1 3 + 7 , 8 + 5 2 3 − 1 , 8. = 8 1 3 + 5 2 3 + 7 , 8 − 1 , 8 = 14 + 6 = 20

a: \(234456-123798\)

\(=230000+4456-123000-798\)

\(=107000+3658=110658\)

b: \(643546-237626\)

\(=643000+546-237000-626\)

\(=406000-80=405920\)

c: \(102078-98968+120330\)

\(=102000+78-98000-968+120000+330\)

\(=124000-560=123440\)

d: \(247122+6929-230400\)

\(=247000+6000+929+122-230000-400\)

\(=23000+651=23651\)

c: \(=5+\dfrac{6}{7}-2-\dfrac{3}{8}-1-\dfrac{1}{8}=2+\dfrac{6}{7}-\dfrac{1}{2}=\dfrac{3}{2}+\dfrac{6}{7}=\dfrac{33}{14}\)

e: \(=\dfrac{-3}{5}\left(-\dfrac{1}{9}-\dfrac{5}{6}+\dfrac{5}{2}\right)=\dfrac{-3}{5}\cdot\dfrac{14}{9}=\dfrac{-14}{15}\)

1234-999

=235

1234-999

=235

tk nhé

ai k mình mình k lại

1234-999=235

            NHANH NHỨT NÈ!!!!!!!!!!!!!!!

=3,26(728+1+270)

=3,26*999=3256,74

\(3,26\cdot728+3,26+3,26\cdot270\)

\(=3,26\cdot\left(728+1+270\right)\)

\(=3,26\cdot999\)

\(=3,26\cdot\left(1000-1\right)\)

\(=3,26\cdot1000-1\cdot3,26\)

\(=3260-3,26\)

\(=3256,74\)

\(=\dfrac{-3}{7}\left(\dfrac{4}{19}+\dfrac{10}{19}\right)+\dfrac{4}{7}\cdot\dfrac{-14}{19}=\dfrac{14}{19}\left(-\dfrac{3}{7}-\dfrac{4}{7}\right)=-\dfrac{14}{19}\)

\(\dfrac{-3}{7}.(\dfrac{4}{19}+\dfrac{10}{19})+\dfrac{4}{7}.\dfrac{-14}{19}\)

\(\dfrac{1}{7}\)