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21 x 25,36 + 25,36 x 80 - 25,36
= 21 x 25,36 + 25,36 x 80 - 25,36 x 1
= 25,36 x ( 21 + 80 - 1 )
= 25,36 x 100
= 2536
/HT\
21 x 25,36 + 25,36 x 80 - 25,36
=21 x 25,36 + 25,36 x 80 - 25,36 x 1
=25,36 x (21 + 80 -1)
= 25,36 x 100
2536
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:\(\frac{23,26\cdot32\cdot0,6}{0,32\cdot6}\Leftrightarrow\frac{2,326\cdot0,32\cdot6}{0,32\cdot6}=\frac{2,326}{1}=2,326\)
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\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.11.2.4.17}{11.17.3.21}=\frac{\left(21.11.17\right).\left(2.4\right)}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)
\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{5.7.13.2}{5.7.13.2.5}=\frac{2}{2.5}=\frac{1}{5}\)
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12,35 + 1,42 - 11,35 + 8,58
= (12,35 - 11,35) + (1,42 + 8,58)
= 1 + 10
= 11
12,35 + 1,42 - 11,35 + 8,58
= 12,35 + (1,42 - 11,35 ) + 8,58
= 12,35 - 9,93 + 8,58
= 2,42 + 8,58
= 11
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=(1/11 + 4/11) + (3/4 + 1/4)
=5/11 + 4/4
=5/11+1
=5/11+ 11/11
=16/11
\(\frac{1}{11}+\frac{3}{4}+\frac{4}{11}+\frac{1}{4}\)
\(=\left(\frac{1}{11}+\frac{4}{11}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)\)
\(=\frac{5}{11}+1\)
\(=1\frac{5}{11}\)
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a,5,6x3,7+5,6x2,3
=5,6x(3,7+2,3)
=5,6x6
=33,6
b,47,85x47-47,85x17
=47,85x(47-17)
=47,85x30
=1435,5