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a) 10; 13; 18; 26; 36; 52...
c) 0; 1; 4; 9; 16; 25...
m) 1; 4; 9; 16; 25; 36; 49; 64...
p) 1; 3; 9; 27; 81; 243...
2/25=.2../25 .27../36=3/4
3/.12..=9/36
15/27=5/..9..
..20..28=5/7
36/72=..1../2
\(\dfrac{2}{25}=\dfrac{2}{25}\)
\(\dfrac{27}{36}=\dfrac{3}{4}\)
\(\dfrac{3}{12}=\dfrac{9}{36}\)
\(\dfrac{15}{27}=\dfrac{5}{9}\)
\(\dfrac{20}{28}=\dfrac{5}{7}\)
\(\dfrac{36}{72}=\dfrac{1}{2}\)
\(a,\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)
\(b,\dfrac{3}{5}\times\dfrac{4}{21}\times\dfrac{25}{3}=\dfrac{20}{21}\)
\(c,\dfrac{15}{16}:\dfrac{5}{8}\times\dfrac{3}{4}=\dfrac{15}{16}\times\dfrac{8}{5}\times\dfrac{3}{4}=\dfrac{9}{8}\)
\(d,\dfrac{21}{4}\times\dfrac{16}{14}\times\dfrac{1}{2}\times\dfrac{8}{3}=8\)
a) 4/9.x=25/18:2/3
4/9.x=25/18.3/2
4/9.x=75/36
x=75/36:4/9
x=75/36x4/9
x=675/144
b)x:4/5=25/8:5/4
x:4/5=25/8x4/5
x:4/5=100/40
x:4/5=5/2
x=5/2x4/5
x=20/10
x=2/1=2
c)22/5:x=44/5:5/2
22/5:x=44/5x2/5
22/5:x=88/25
x=88/25:22/5
x=88/25x22/5
x=440/550
x=4/5
h nk
a ] mình thấy bạn hình như ghi sai đề
b ] x : [ 25 + 417 ] = 138 = x : 442
x = 442 x 138 = 60996
24 x 36 + 18 x 24 + 18 x 45 - 18 x 7 = 18 x 24 x 2 + 18 x 24 + 18 x 45 - 18 x 7 =
18 x ( 48 + 24 + 45 - 7 ) = 18 x 110 = 1980
\(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}=\frac{27+9+3+1}{81}=\frac{40}{81}\)
\(\frac{3}{5}< x< \frac{4}{5}\) | \(x=\frac{31}{50}\)
3,5 < x < 3,6 | x = 3,51
B = \(\dfrac{25}{18}\) - \(\dfrac{5}{4}\) : \(\dfrac{3}{2}\) + \(\dfrac{9}{4}\) \(\times\) \(\dfrac{16}{27}\)
B = \(\dfrac{25}{18}\) - \(\dfrac{5}{4}\) \(\times\) \(\dfrac{2}{3}\) + \(\dfrac{4}{3}\)
B = \(\dfrac{25}{18}\) - \(\dfrac{5}{6}\) + \(\dfrac{4}{3}\)
B = \(\dfrac{25}{18}\) - \(\dfrac{15}{18}\) + \(\dfrac{24}{18}\)
B = \(\dfrac{34}{18}\)
B = \(\dfrac{17}{9}\)
kết quả b=\(\dfrac{17}{9}\)bạn nhé