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\(=\dfrac{36\cdot22\cdot51}{11\cdot17\cdot72}=\dfrac{1}{2}\cdot3\cdot2=3\)
\(\frac{36x22x51}{11x17x72}\)=\(\frac{2x3}{2}\)=3
giảm ước 36 và 72, 22 và 11, 51 và 17
chữa :
a) \(\frac{6}{25}:\frac{21}{20}=\frac{6}{25}.\frac{20}{21}=\frac{6.20}{25.21}=\frac{3.2.4.5}{5.5.7.3}=\frac{8}{35}\)
623+x=1019
x=1019-623
x=396
413+(x+9)=1994
(x+9)=1994-413
x+9=1581
x=1581-9
x=1572
519+(73-x)=563
72-x =563 - 519
72- x=44
x=72-44
x=28
\(\frac{11}{3}:\frac{99}{21}-\frac{5}{18}\)
\(=\frac{11}{3}.\frac{21}{99}-\frac{5}{18}=\frac{7}{9}-\frac{5}{18}=\frac{14}{18}-\frac{5}{18}\)
\(=\frac{9}{18}=\frac{1}{2}\)
\(\frac{4}{5}+\frac{16}{5}:\frac{4}{55}\)
\(=\frac{4}{5}+\frac{16}{5}.\frac{55}{4}=\frac{4}{5}+11=\frac{4}{5}+\frac{55}{5}\)
\(=\frac{59}{5}\)
11/3:99/21-5/18 =11/3*21/99-5/18=7/9-5/18=15/18-5/18=10/18=5/9 4/5+16/5:4/55=4/5+16/5*55/4=4/5+44=4/5+220/5=224/5 26:13/17:34/7=26*17/13*34/7=34:34/7 =7
\(26:\frac{13}{17}.\frac{34}{7}\)
\(=26.\frac{17}{13}.\frac{34}{7}=2.17.\frac{34}{7}=34.\frac{34}{7}\)
\(=\frac{1156}{7}\)
36/11 x 22/17 x 51/72
= 36 x 22 x 51/11 x 17 x 72
= 36 x 2 x 11 x 17 x 3/11 x 17 x 36 x 2
= 3
22/16 x 64/55 x 27/13
= 22 x 64 x 27/16 x 55 x 13
=2 x 11 x 16 x 4 x 27/16 x 5 x 11 x 13
= 216/65
36 x 48/12 x 24 + 18 x 104/36 x 4
= 12 x 3 x 2 x 24/12 x 24 + 18 x 13 x 2 x 4/ 18 x 2 x 4
= 6 + 13
= 19
=
\(\frac{22\cdot13\cdot17}{55\cdot26\cdot51}\)
\(=\frac{22\cdot13\cdot17}{55\cdot13\cdot2\cdot3\cdot17}\)
\(=\frac{11\cdot2}{55\cdot2\cdot3}\)
\(=\frac{11}{55\cdot3}=\frac{11}{165}\)
\(\frac{22.13.17}{55.26.51}\) = \(\frac{2.11.13.17}{11.5.13.2.17.3}\) = \(\frac{1}{15}\)
. là dấu nhân nhé