=37.75+37.45-25.2.37-35.14

=37.(75+45+50)-35.14

=37.70-35.14

=37.2.35-35.14

=74.35-35.14

=35.(74-14)

=35.60

=2100

37.75+37.45-25.74-35.14=2100  

\(37\cdot75+63\cdot75=75\cdot\left(37+63\right)=75\cdot100=7500\)

K MK NHA.

#ngố

37.75 + 63.75

= (37 + 63).75

= 100.75

= 7500

37 . 75 + 63 . 75 = ( 37 + 63 ) . 75

                           =     100  .  75

                           =         7500

a) 37.75+37.45+63.67+63.53

= 37.(75 + 45) + 63.(67 + 53)

= 37 . 120 + 63 . 120

= 120 . (37 + 63)

= 120 . 100

= 12 000

a) 37.75+37.45+63.67+63.53

= 37.(75+45)+63.(67+53)

= 37.120+63.120

= 120.(37+63)

= 120.100

= 12000

b) 35.34+35.86+65.75+65.45

= 35.(34+86)+65.(75+45)

= 35.120+65.120

=120.(35+65)

= 120.100

= 12000

c) 78.31+78.24+78.17+22.72

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

= 72.100

= 7200

$\mathrm{a)\; 37}.75+37.45+63.67+63.53$

$=37.(75+45)+63.(67+53)$

$=37.120+63.120$

$=(37+63).120$

$=100.120$

$=12000$

b) 35⋅34+35⋅86+65⋅75+65⋅45=35(34+86)+65(75+45)=35⋅120+65⋅120=(35+65)⋅120=100⋅120=12000

c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 .100

= 7200

chúc bạn học tốt ❤❤❤

$\mathrm{a)\; 37}.75+37.45+63.67+63.53$

$=37.(75+45)+63.(67+53)$

$=37.120+63.120$

$=(37+63).120$

$=100.120$

$=12000$

b) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45

= 35 . ( 34 + 86 ) + 65 . ( 75 + 45 )

= 35 . 120 + 65 . 120

= ( 35 + 65 ) . 120

= 100 . 120

=12000

c) 78 . 31 + 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

chúc bạn học tốt

\(\left(-2021\right).\left(23+76\right)-2021=\left(-2021\right).99-2021=-202100\)

=-2021x100=-202100

\(5,-\dfrac{2}{7}-\left(\dfrac{5}{11}-\dfrac{9}{7}\right)+\dfrac{5}{11}=-\dfrac{2}{7}-\dfrac{5}{11}+\dfrac{9}{7}+\dfrac{5}{11}=\left(-\dfrac{2}{7}+\dfrac{9}{7}\right)-\left(\dfrac{5}{11}-\dfrac{5}{11}\right)=1-0=1\\ 6,\dfrac{2}{3}+\dfrac{-2}{5}+\dfrac{-5}{6}-\dfrac{13}{10}=\left(\dfrac{4}{6}+\dfrac{-5}{6}\right)+\left(\dfrac{-4}{10}-\dfrac{13}{10}\right)=\dfrac{-1}{6}+\dfrac{-17}{10}=\dfrac{-5}{30}+\dfrac{-51}{30}=\dfrac{-56}{30}=\dfrac{-28}{15}\)

\(7,\dfrac{-5}{9}+\dfrac{8}{15}+\dfrac{4}{-9}+\dfrac{7}{15}=\left(\dfrac{-5}{9}+\dfrac{-4}{9}\right)+\left(\dfrac{8}{15}+\dfrac{7}{15}\right)=\left(-1\right)+1=0\\ 8,\left(\dfrac{12}{13}+7\right)-\left(-\dfrac{1}{13}+8\right)=\dfrac{12}{13}+7+\dfrac{1}{13}-8=\left(\dfrac{12}{13}+\dfrac{1}{13}\right)+\left(7-8\right)=1+\left(-1\right)=0\)

a) \(\left(\dfrac{3}{8}-\dfrac{1}{5}-\dfrac{1}{3}\right)+\left(\dfrac{5}{8}-1\dfrac{3}{7}-\dfrac{4}{7}\right)+\dfrac{1}{3}\)

\(=\dfrac{3}{8}-\dfrac{1}{5}-\dfrac{1}{3}+\dfrac{5}{8}-\dfrac{10}{7}-\dfrac{4}{7}+\dfrac{1}{3}\)

\(=\left(\dfrac{3}{8}+\dfrac{5}{8}\right)+\left(\dfrac{-1}{3}+\dfrac{1}{3}\right)+\left(\dfrac{-10}{7}-\dfrac{4}{7}\right)-\dfrac{1}{5}\)

\(=1+0+\left(-2\right)-\dfrac{1}{5}\)

\(=-1-\dfrac{1}{5}\)

\(=\dfrac{-6}{5}\)

b) \(-24.\left(\dfrac{1}{3}-\dfrac{1}{4}\right)^2-1,5\)

\(=-24.\left(\dfrac{1}{12}\right)^2-\dfrac{3}{2}\)

\(=-24.\dfrac{1}{144}-\dfrac{3}{2}\)

\(=\dfrac{-1}{6}-\dfrac{3}{2}=\dfrac{-1}{6}-\dfrac{9}{6}=\dfrac{-10}{6}=\dfrac{-5}{3}\)

c) \(2^2-\left(-\dfrac{5}{7}\right)^0+\left(\dfrac{1}{3}\right)^4.3^6\)

\(=4-1+\dfrac{1}{81}.729\)

\(=4-1+9\)

\(=3+9=12\)

d) \(23\dfrac{1}{3}:\left(\dfrac{-5}{7}\right)+13\dfrac{1}{3}:\dfrac{5}{7}\)

\(=\dfrac{-70}{3}.\dfrac{7}{5}+\dfrac{40}{3}.\dfrac{7}{5}\)

\(=\dfrac{7}{5}\left(\dfrac{-70}{3}-\dfrac{40}{3}\right)\)

\(=\dfrac{7}{5}.\left(-10\right)\)

\(=-14\)

e) \(\dfrac{3}{4}.\dfrac{8}{5}+\dfrac{6}{15}:\dfrac{4}{3}-1\dfrac{2}{5}:1\dfrac{1}{3}\)

\(=\dfrac{3}{4}.\dfrac{8}{5}+\dfrac{6}{15}.\dfrac{3}{4}-\dfrac{7}{5}.\dfrac{3}{4}\)

\(=\dfrac{3}{4}\left(\dfrac{8}{5}+\dfrac{6}{15}-\dfrac{7}{5}\right)\)

\(=\dfrac{3}{4}\left(\dfrac{24}{15}+\dfrac{6}{15}-\dfrac{21}{15}\right)\)

\(=\dfrac{3}{4}.\dfrac{9}{15}\)

\(=\dfrac{9}{20}\)

122/456

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