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\(a,\frac{1}{3}+\frac{6}{11}.\frac{22}{5}-\frac{3}{4}:1,5=\frac{1}{3}+\frac{6.2}{5}-\frac{3}{4}:\frac{3}{2}=\frac{1}{3}+\frac{12}{5}-\frac{1}{2}=\frac{10}{30}+\frac{72}{5}-\frac{15}{30}=\frac{67}{30}\)
\(b, 3.3,5.6+2.6,4.9+1,8=18.3,5+18.6,4+1,8=18\left(3,5+6,4\right)+1,8=18.9,9+1,8=1,8.99+1,8=1,8\left(1+99\right)=1,8.100=180\)
b ) 3 x 3,5 x 6 + 2 x 6,4 x 9 + 1,8
= 18 x 3,5 + 18x 6,4 + 18 x 0,1
= 18 ( 3,5 + 6,4 + 0,1)
= 18 x 10
= 180
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\(x+7=-12-3\)
\(x+7=-15\)
\(x=-15-7\)
\(x=-22\)
\(13-x=20-\left(-31\right)\)
\(13-x=51\)
\(x=13-51\)
\(x=-38\)
\(2x-41=-19-2\)
\(2x-41=-21\)
\(2x=-21+41\)
\(2x=20\)
\(x=20:2\)
\(x=10\)
\(\left(x-1\right).2+14=30-\left(-14\right)\)
\(2x-2+14=44\)
\(2x-2=44-14\)
\(2x-2=30\)
\(2x=30+2\)
\(2x=32\)
\(x=16\)
cho minh hoi:tap hop cac so co 2 chu so chia het cho va 9
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\(\left(3\dfrac{1}{3}+2,5\right)\) : (\(\left(3\dfrac{1}{6}-4\dfrac{1}{5}\right)\) - \(\frac{11}{31}\)
=(\(\frac{10}{3}\)+2,5) : (\(\frac{19}{6}\) -\(\frac{21}{5}\)) -\(\frac{11}{31}\)
=\(\frac{35}{6}\) : \(\frac{-31}{30}\) - \(\frac{11}{31}\) = - \(\frac{175}{31}\) - \(\frac{11}{31}\) = - 6
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a: =2,7-51,4-48,6+7,3
=10-100=-90
b: =2,5(-0,124+10,124)=2,5x10=25
c: =-80-0,016=79,984
Giúp mình với mình cần gấp
mik nghĩ là \(\frac{21}{6}\)
-HT-