7819+23 X 7819 + 199 - 1900 LƯU Ý TÍNH CÁCH THUÂN TIỆN NHA MẤY CHẾ
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9187 - x : 409 = 7819
x : 409 = 9187 - 7819
x : 409 = 1368
x = 1368 * 409
x = 559512
A. = 14/15 * 15/23 * 23/21
= 14/23 * 23/21
= 14/21
B. = 1/2 * (9/10 + 8/10 - 7/10)
= 1/2 * 10/10
= 1/2 * 1
= 1/2
a) \(\frac{14}{15}\cdot\frac{23}{21}\cdot\frac{15}{23}=\frac{14}{21}=\frac{2}{3}\)
b)\(\frac{1}{2}\cdot\frac{9}{10}+\frac{1}{2}\cdot\frac{8}{10}-\frac{1}{2}\cdot\frac{7}{10}=\frac{1}{2}\cdot\left(\frac{9}{10}+\frac{8}{10}-\frac{7}{10}\right)=\frac{1}{2}\cdot1=\frac{1}{2}\)
\(25\times32\times125\times15\\=(25\times4)\times(8\times125)\times15\\=100\times1000\times15\\=100000\times15\\=1500000\)
25 x 32 x 125 x 15
=(125 x 32 ) x (25 x 15 )
= 4000 x 375
=1 500 000
a,2009x867+2009x133=2009x(867+133)=2009x1000=2009000
b,có vẻ sai đề.
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
Ta có:\(\frac{23,26\cdot32\cdot0,6}{0,32\cdot6}\Leftrightarrow\frac{2,326\cdot0,32\cdot6}{0,32\cdot6}=\frac{2,326}{1}=2,326\)
\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.11.2.4.17}{11.17.3.21}=\frac{\left(21.11.17\right).\left(2.4\right)}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)
\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{5.7.13.2}{5.7.13.2.5}=\frac{2}{2.5}=\frac{1}{5}\)