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a. = 12 + -12 + [-24]
=0+[-24]
=-24
b. = 23 + -23 + 23
=0+23
=23
cho mik nhé
hok tốt
hihi
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`7/19*8/11-7/19*(-3)/11+12/19`
`=7/19*(8/11-(-3)/11)+12/19`
`=7/19*1+12/19`
`=7/19+12/19`
`=19/19=1`
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`A = |6 : 3/5 - 1 1/6 . 6/7| : |4 1/5 . 10/11 + 5 2/11|`
`=|10 - 1| : |42/11 + 57/11|`
`=9 : 9`
`=1`
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\left|6\cdot\dfrac{5}{3}-\dfrac{7}{6}\cdot\dfrac{6}{7}\right|:\left|\dfrac{21}{5}\cdot\dfrac{10}{11}+5+\dfrac{2}{11}\right|\)
\(=\left|10-1\right|:\left|\dfrac{42}{11}+\dfrac{2}{11}+5\right|\)
\(=9:9=1\)
b: \(=\dfrac{1}{2}\cdot\dfrac{2}{3}\cdot\dfrac{3}{4}\cdot...\cdot\dfrac{2002}{2003}\cdot\dfrac{2003}{2004}=\dfrac{1}{2004}\)
c: \(=\dfrac{59}{10}\cdot\dfrac{2}{3}-\left|\dfrac{7}{3}\cdot\dfrac{9}{2}-2\cdot\dfrac{7}{3}\right|\cdot\dfrac{4}{7}\)
\(=\dfrac{59}{15}-\dfrac{7}{3}\cdot\dfrac{5}{2}\cdot\dfrac{4}{7}\)
\(=\dfrac{59}{15}-\dfrac{10}{3}=\dfrac{59-50}{15}=\dfrac{9}{15}=\dfrac{3}{5}\)
43.76 - 4.56 + 80.7
=64.74-4.56+80.7
=4736-224+560
=4512+560
=5072