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A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
=1x2x3x4x5x6x7x8x9
2x3x4x5x6x7x8x9x10
= 1
10
a) \(\frac{9}{22}\cdot\frac{33}{8}=\frac{3^2\cdot3\cdot11}{2\cdot11\cdot2^3}=\frac{3^4}{2^4}=\frac{81}{16}\)
b) \(\frac{12}{35}:\frac{36}{35}=\frac{2^2\cdot3}{2^2\cdot3^2}=\frac{1}{3}\)
c) \(\frac{19}{17}:\frac{76}{51}=\frac{19\cdot3\cdot17}{17\cdot2^2\cdot19}=\frac{3}{4}\)
a) 6/7 - 3/6 = 21/42 - 21/42 = 15/42
b) 2/5 x 4/7 = 8/35
c) 3/10 : 6/10 = 3/10 x 10/6 = 1/2
d) 5/9 + 3/4 = 32/36 = 8/9
e) 1/3 : 6 = 1/3 x 1/6 = 1/18
g) 3 x 2/5 = 6/5
h) 6/7 + 4/21 = 22/21
k cho mk nhé!
a) (4/5+3/10+1/5+7/10) x 3 x 5/6 bằng (1+1) x 3 x 5/6 bằng 6x 5/6 bằng 5
b) đặt 1+3+5+...+99 là A suy ra A x(2-2) bằng A x0 bằng 0
\(a,\frac{8}{5}+\frac{3}{10}=\frac{16}{10}+\frac{3}{10}=\frac{19}{10}\)
\(b,\frac{2}{3}+\frac{3}{4}+\frac{1}{6}=\frac{8}{12}+\frac{9}{12}+\frac{2}{12}\)\(=\frac{19}{12}\)
\(c,\frac{5}{6}-\frac{2}{9}=\frac{15}{18}-\frac{4}{18}=\frac{11}{18}\)
\(\frac{2}{3}:\frac{5}{6}=\frac{4}{5}\)
\(\frac{4}{5}\cdot\frac{2}{3}=\frac{8}{15}\)
Vậy : \(\frac{2}{3}:\frac{5}{6}< \frac{4}{5}x\cdot\frac{2}{3}\)nên \(\frac{4}{5}< \frac{8}{15}\)
Mình làm câu A
\(\frac{1}{2}\cdot\frac{3}{4}=\frac{3}{8}\)\(;\frac{5}{8}:\frac{6}{8}=\frac{5}{6}\)
Vậy \(\frac{1}{2}\cdot\frac{3}{4}< \frac{5}{8}:\frac{6}{8}\)
Nên : \(\frac{3}{8}< \frac{5}{6}\)
`6:5/2-3/10`
`=6xx2/5-3/10`
`=12/5-3/10`
`=24/10-3/10`
`=19/10`
\(6:\dfrac{5}{2}-\dfrac{3}{10}\)
\(=6\times\dfrac{2}{5}-\dfrac{3}{10}\)
\(=\dfrac{12}{5}-\dfrac{3}{10}\)
\(=\dfrac{24}{10}-\dfrac{3}{10}\)
\(=\dfrac{21}{10}\)