8/19 • 5/11 + 8/19 • 6/11 + 11/19
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TD
2
ND
10 tháng 4 2017
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{7}{19}.\dfrac{8}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\dfrac{5}{11}+\dfrac{8}{19}.\dfrac{7}{11}-\dfrac{8}{19}.\dfrac{1}{11}\)
=\(\dfrac{8}{19}.\left(\dfrac{5}{11}+\dfrac{7}{11}-\dfrac{1}{11}\right)\)
=\(\dfrac{8}{19}\).1
=\(\dfrac{8}{19}\)
PN
5
18 tháng 7 2018
\(1) 325+128+12+25\)
\(=(325+25)+(128+12)\)
\(=350+140\)
\(=490\)
\(2) 36,372+63,372+372\)
\(=99,744+372\)
\(=471,744\)
\(3) \frac{8}{19}:\frac{5}{11}+\frac{8}{19}:\frac{6}{11}+\frac{11}{19}\)
\(=\frac{8}{19}.\frac{11}{5}+\frac{8}{19}.\frac{11}{6}+\frac{11}{19}\)
\(=\frac{8}{19}.(\frac{11}{5}+\frac{11}{6})+\frac{11}{9}\)
\(=\frac{8}{19}.\frac{121}{30}+\frac{11}{9}\)
\(= \frac{484}{285}+\frac{11}{9}\)
\(=\frac{2497}{855}\)
~Hok tốt a~
LK
1
27 tháng 3 2019
D = 8/19 . 5/11 + 7/11 . 8/19 - 8/19 . 1/11
= 8/19 . ( 5/11 + 7/11 - 1/11)
= 8/19 . 5 + 7 - 1 / 11
= 8/19 . 11/11
= 8/19 . 1
= 8/19
#Hoq chắc _ Baccanngon
18 tháng 3 2017
\(\dfrac{7}{-25}+\dfrac{18}{25}+\dfrac{4}{23}+\dfrac{5}{7}+\dfrac{19}{23}\)
=\(\left(\dfrac{-7}{25}+\dfrac{18}{25}\right)+\left(\dfrac{4}{23}+\dfrac{19}{23}\right)+\dfrac{5}{7}\)
= \(\dfrac{11}{25} +1+\dfrac{5}{7}\)
= \(1\dfrac{11}{25}+\dfrac{5}{7}\)
= \(2\dfrac{27}{175}\)
b) \(-2+\dfrac{15}{19}+\dfrac{-15}{17}+\dfrac{15}{23}+\dfrac{4}{19}\)
=\(-2+\left(\dfrac{ }{ }\right)\)
VT
31 tháng 12 2022
\(C=\dfrac{4}{9}\times\dfrac{13}{17}+\dfrac{4}{17}\times\dfrac{4}{9}+\dfrac{2}{9}\\ =\dfrac{4}{9}\times\left(\dfrac{13}{17}+\dfrac{4}{17}\right)+\dfrac{2}{9}\\ =\dfrac{4}{9}\times1+\dfrac{2}{9}\\ =\dfrac{4}{9}+\dfrac{2}{9}\\ =\dfrac{6}{9}=\dfrac{2}{3}\)
\(D=\dfrac{8}{19}\times\dfrac{5}{11}+\dfrac{7}{11}\times\dfrac{8}{19}+\dfrac{12}{11}\times\dfrac{11}{19}\\ =\dfrac{8}{19}\times\left(\dfrac{5}{11}+\dfrac{7}{11}\right)+\dfrac{12}{11}\times\dfrac{11}{19}\\ =\dfrac{8}{19}\times\dfrac{12}{11}+\dfrac{12}{11}\times\dfrac{11}{19}\\ =\dfrac{12}{11}\times\left(\dfrac{8}{19}+\dfrac{11}{19}\right)\\ =\dfrac{12}{11}\times19\\ =\dfrac{12}{11}\)
31 tháng 12 2022
\(C=\dfrac{4}{9}\cdot\dfrac{13}{17}+\dfrac{4}{17}\cdot\dfrac{4}{9}+\dfrac{2}{9}\)
\(C=\dfrac{4}{9}\cdot\left(\dfrac{13}{17}+\dfrac{4}{17}\right)+\dfrac{2}{9}\)
\(C=\dfrac{4}{9}\cdot\dfrac{13+4}{17}+\dfrac{2}{9}\)
\(C=\dfrac{4}{9}\cdot\dfrac{17}{17}+\dfrac{9}{2}\)
\(C=\dfrac{4}{9}\cdot1+\dfrac{2}{9}\)
\(C=\dfrac{4}{9}+\dfrac{2}{9}\)
\(C=\dfrac{4+2}{9}\)
\(C=\dfrac{6}{9}\)
\(C=\dfrac{2}{3}\)
\(D=\dfrac{8}{19}\cdot\dfrac{5}{11}+\dfrac{7}{11}\cdot\dfrac{8}{19}+\dfrac{12}{11}\cdot\dfrac{11}{19}\)
\(D=\dfrac{8}{19}\cdot\left(\dfrac{5}{11}+\dfrac{7}{11}\right)+\dfrac{12}{11}\cdot\dfrac{11}{19}\)
\(D=\dfrac{8}{19}\cdot\dfrac{12}{11}+\dfrac{12}{11}\cdot\dfrac{11}{19}\)
\(D=\dfrac{12}{11}\cdot\left(\dfrac{8}{19}+\dfrac{11}{19}\right)\)
\(D=\dfrac{12}{11}\cdot\dfrac{19}{19}\)
\(D=\dfrac{12}{11}\cdot1\)
\(D=\dfrac{12}{11}\)
LK
0
=8/19x(5/11+6/11)+11/19
=8/19x1+11/19
=1