Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)\(\frac{2}{3}:\frac{4}{9}+\frac{1}{3}:\frac{4}{9}\)
=\(\frac{4}{9}:\left(\frac{2}{3}+\frac{1}{3}\right)\)
=\(\frac{4}{9}:1=\frac{4}{9}\)
b
a) \(\frac{6}{5}\)- \(\frac{2}{3}\)= \(\frac{18}{15}\)- \(\frac{10}{15}\)= \(\frac{8}{15}\)
b) 1 - \(\frac{4}{5}\)= \(\frac{5}{5}\)- \(\frac{4}{5}\)= \(\frac{1}{5}\)
c) \(\frac{5}{12}\)- \(\frac{1}{4}\)= \(\frac{5}{12}\)- \(\frac{3}{12}\)= \(\frac{2}{12}\)= \(\frac{1}{6}\)
d) \(\frac{7}{8}\) - \(\frac{1}{6}\) = \(\frac{21}{24}\) - \(\frac{4}{24}\)= \(\frac{17}{24}\)
~HT~
a) 6/5 - 2/3 = 8/15
b) 1 - 4/5 = 1/5
c) 5/12 - 1/4 = 1/6
d) 7/8 - 1/6 = 17/24
HT~
\(\frac{7}{15}+\frac{4}{5}=\frac{19}{15}\) \(\frac{4}{5}\times\frac{5}{8}=\frac{1}{2}\)
\(\frac{2}{3}-\frac{3}{8}=\frac{7}{24}\) \(\frac{1}{2}\div\frac{2}{5}=\frac{1}{5}\)
=7/15+12/15=19/15
=16/24-9/24
=4/5x5/8=1/2
=1/2x5/2=5/4
b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10
=1x2x3x4x5x6x7x8x9
2x3x4x5x6x7x8x9x10
= 1
10
7/15+4/5= 7/15+12/15= 19/15
2/3-3/8= 16/24-9/24= 7/24
\(\frac{4}{5}\times\frac{5}{8}=\frac{4\times5}{5\times8}=\frac{20}{40}\)\(=\frac{1}{2}\)
1/2:2/5=5/4
\(\frac{7}{15}+\frac{4}{5}=\frac{7}{15}+\frac{12}{15}=\frac{19}{15}\)
\(\frac{2}{3}-\frac{3}{8}=\frac{16}{24}-\frac{9}{24}=\frac{7}{24}\)
\(\frac{4}{5}\times\frac{5}{8}=\frac{4}{8}=\frac{1}{2}\)
\(\frac{1}{2}\div\frac{2}{5}=\frac{1}{2}\times\frac{5}{2}=\frac{5}{4}\)