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5/7 < 4/3
7/2 > 4/79
2/5 < 6/10
15/23 < 1
1/4 = 3/12
27/9 > 2
27/36 > 2/9
14/15 < 1
7/6 > 7/9
51/17 = 3/1
tk mình nha bạn, mình kp vs bạn r đó. .. ^^
5/7 < 4/3 7/2 > 4/79 2/5 < 6/10 15/23 < 1 1/4 = 3/12 27/9 > 2 27/36 > 2/9 14/15 < 1 7/6 > 7/9 51/17 = 3/1
cái này dễ quá em ơi chỉ cần nhớ kiến thức cơ bản là làm được em nên tự làm nhé
8/9 x 5/4 + 3/5 = 10/9 + 3/5 = 77/45
5/8 + 1/4 = 5/9 + 2/8 = 7/8
1/2 + 5/9 = 9/18 + 5/9 = 14/9
9/8 x 3/4 - 4/7 = 27/32 - 4/7 = 61/224
a) \(\dfrac{8}{9}:\dfrac{4}{5}+\dfrac{3}{5}=\dfrac{8}{9}\times\dfrac{5}{4}+\dfrac{2}{5}=\dfrac{10}{9}+\dfrac{2}{5}=\dfrac{50}{45}+\dfrac{18}{45}=\dfrac{68}{45}\)
b) \(\dfrac{5}{8}+\dfrac{1}{4}=\dfrac{5}{8}+\dfrac{2}{8}=\dfrac{6}{8}=\dfrac{3}{4}\)
c) \(\dfrac{7}{8}\times\dfrac{4}{7}+\dfrac{5}{9}=\dfrac{1}{2}+\dfrac{5}{9}=\dfrac{9}{18}+\dfrac{10}{18}=\dfrac{19}{18}\)
d) \(\dfrac{9}{8}:\dfrac{4}{3}-\dfrac{4}{7}=\dfrac{9}{8}\times\dfrac{3}{4}-\dfrac{4}{7}=\dfrac{27}{32}-\dfrac{4}{7}=\dfrac{61}{244}\)
\(\dfrac{2}{9}+\dfrac{3}{9}=\dfrac{5}{9}\)
\(\dfrac{3}{15}+\dfrac{5}{5}=\dfrac{1}{5}+\dfrac{5}{5}=\dfrac{6}{5}\)
\(\dfrac{4}{25}+\dfrac{3}{100}=\dfrac{16}{100}+\dfrac{3}{100}=\dfrac{19}{100}\)
\(\dfrac{4}{9}+\dfrac{3}{2}=\dfrac{8}{18}+\dfrac{27}{18}=\dfrac{35}{18}\)
\(\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10}{15}-\dfrac{6}{15}=\dfrac{4}{15}\)
____________________________
\(\dfrac{4}{15}+\dfrac{9}{5}=\dfrac{4}{15}+\dfrac{27}{15}=\dfrac{31}{15}\)
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\(\dfrac{7}{4}-\dfrac{1}{3}:\dfrac{4}{5}=\dfrac{7}{4}-\dfrac{1}{3}\times\dfrac{5}{4}=\dfrac{7}{4}-\dfrac{5}{12}=\dfrac{21}{12}-\dfrac{5}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
Chúc bạn học tốt:>
a, \(\dfrac{2}{3}\) - \(\dfrac{2}{5}\) = \(\dfrac{10}{15}\) - \(\dfrac{6}{15}\) = \(\dfrac{4}{15}\)
b, \(\dfrac{4}{15}\) + \(\dfrac{9}{5}\) = \(\dfrac{4}{15}\) + \(\dfrac{27}{15}\) = \(\dfrac{31}{15}\)
c, \(\dfrac{7}{4}\) - \(\dfrac{1}{3}\) : \(\dfrac{4}{5}\) = \(\dfrac{7}{4}\)- \(\dfrac{5}{12}\) = \(\dfrac{21}{12}\) - \(\dfrac{5}{12}\) = \(\dfrac{16}{12}\) = \(\dfrac{4}{3}\)
a) S
⇒ \(\dfrac{3}{5}+\dfrac{1}{4}=\dfrac{12}{20}+\dfrac{5}{20}=\dfrac{17}{20}\)
b) \(\)Đ
c) Đ
d) S
⇒ \(\dfrac{3}{4}:\dfrac{4}{9}=\dfrac{3}{4}\times\dfrac{9}{4}=\dfrac{27}{16}\)
* Mình chỉ giải thích những câu sai thôi nha
Chúc bạn học tốt
TL
a) \(\frac{3}{4}+\frac{4}{4}=\frac{7}{4}\)
\(\frac{5}{9}+\frac{7}{9}=\frac{12}{9}=\frac{4}{3}\)
nha bn
HT
a) = 7/4
b) = 716/9