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234456
-
123798
________
110658
ĐÂY NHÉ !!! ĐÚNG CHO MK LIKE NHEN !!!
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
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: \(=\dfrac{-3}{5}\left(-\dfrac{1}{9}-\dfrac{5}{6}+\dfrac{5}{2}\right)=\dfrac{-3}{5}\cdot\dfrac{14}{9}=\dfrac{-14}{15}\)
\(A=2019^2-\left(2019-3\right)\left(2019+3\right)\\ A=2019-2019^2-2019\cdot3+2019\cdot3+3^2\\ A=9\)
25.6.4.8.125
=(25.4).(125.8).6
=100.1000.6
=100000.6
=600000
\(25\cdot6\cdot4\cdot8\cdot125\)
\(=25\cdot4\cdot6\cdot8\cdot125\)
\(=100\cdot6\cdot1000\)
\(=100000\cdot6\)
\(=600000\)
\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27.1000=27000\)
Ta có: 25.5.4.27.2 = 27 . (25.4) . (5.2)
= 27 . 100 . 10 = 27000