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tính
3/5 : 3/7 =.................
3/7 nhân 8/5 - 16/35 =..............................................
Bài làm
- \(\frac{3}{5}:\frac{3}{7}=\frac{3}{5}x\frac{7}{3}=\frac{21}{15}=\frac{7}{5}\)
- \(\frac{3}{7}x\frac{8}{5}-\frac{16}{35}\)
= \(\frac{24}{35}-\frac{16}{35}\)
= \(\frac{8}{35}\)
# Chúc bạn học tốt #
\(\frac{3}{5}:\frac{3}{7}=\frac{3}{5}\times\frac{7}{3}=\frac{3\times7}{5\times3}=\frac{1\times7}{5\times1}=\frac{7}{5}\)
\(\frac{3}{7}\times\frac{8}{5}-\frac{16}{35}=\frac{3\times8}{7\times5}-\frac{16}{35}=\frac{24}{35}-\frac{16}{35}=\frac{8}{35}\)
1/ ( \(\frac{13}{2}\)+ \(\frac{14}{6}\)) - ( \(\frac{5}{15}\) + \(\frac{1}{3}\))
= \(\frac{53}{6}\) - \(\frac{2}{3}\)
= \(\frac{49}{6}\)
2/ \(\frac{4}{16}\)+ \(\frac{3}{4}\)+ \(\frac{4}{16}\) - \(\frac{3}{4}\)
= \(\frac{1}{2}\)
3/ ( \(\frac{35}{70}\)- \(\frac{2}{10}\)) + ( \(\frac{14}{8}\)-1)
= \(\frac{3}{10}\)+ \(\frac{3}{4}\)
= \(\frac{21}{20}\)
k cho mk nha
=(1-1/2)(1+1/2)*...*(1+1/10)(1-1/10)
=1/2*2/3*...*9/10*3/2*4/3*...*11/10
=1/10*11/2
=11/20
\(\frac{4}{3}\times\frac{9}{8}\times...\times\frac{81}{80}=\frac{2^2}{1\times3}\times\frac{3^2}{2\times4}\times...\times\frac{9^2}{8\times10}\)
\(=\frac{2\times3\times4\times...\times9}{1\times2\times3\times...\times8}\times\frac{2\times3\times4\times...\times9}{3\times4\times5\times...\times10}\\ =\frac{9}{1}\times\frac{2}{10}=\frac{9}{5}\)
4/3.9/8.16/15.25/24.36/35.49/48.64/63.81/80
=3/2.16/15.25/24.36/35.49/48.64/63.81/80
=5/3.36/35.49/48.64/63.81/80
=7/4.64/63.81/80
=9/5
+
a) \(\dfrac{16}{24}-\dfrac{1}{3}=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)
b ) \(\dfrac{4}{5}-\dfrac{12}{60}=\dfrac{4}{5}-\dfrac{1}{5}=\dfrac{4}{5}\)
c ) \(\dfrac{35}{50}-\dfrac{3}{10}=\dfrac{7}{10}-\dfrac{3}{10}=\dfrac{4}{10}=\dfrac{2}{5}\)
d ) \(\dfrac{21}{28}-\dfrac{1}{4}=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)
1.a) 3/4 > 5/10
b) 35/25 > 16/14
2.a) 7/5 > 5/7
b) 14/16 < 24/21
HT nha
( bạn t.i.c.k cho mik nha, mik cảm ơn )
\(\dfrac{45}{135}=\dfrac{45:45}{135:45}=\dfrac{1}{3}\)
\(\dfrac{117}{234}=\dfrac{117:117}{234:117}=\dfrac{1}{2}\)
\(\dfrac{1515}{2727}=\dfrac{1515:303}{2727:303}=\dfrac{5}{9}\)
\(\dfrac{232323}{494949}=\dfrac{232323:10101}{494949:10101}=\dfrac{23}{49}\)
\(\left(x-\dfrac{1}{3}\right)+\dfrac{1}{4}=\dfrac{1}{2}\)
\(x-\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{1}{4}\)
\(x-\dfrac{1}{3}=\dfrac{2}{4}-\dfrac{1}{4}\)
\(x-\dfrac{1}{3}=\dfrac{1}{4}\)
\(x=\dfrac{1}{4}+\dfrac{1}{3}\)
\(x=\dfrac{3}{12}+\dfrac{4}{12}\)
\(x=\dfrac{7}{12}\)
\(x-\left(\dfrac{1}{7}+\dfrac{2}{5}\right)=\dfrac{16}{35}\)
\(x-\left(\dfrac{5}{35}+\dfrac{14}{35}\right)=\dfrac{16}{35}\)
\(x-\dfrac{19}{35}=\dfrac{16}{35}\)
\(x=\dfrac{16}{35}+\dfrac{19}{35}\)
\(x=\dfrac{35}{35}\)
\(x=1\)
\(x+\dfrac{3}{7}=\dfrac{2}{5}+\dfrac{3}{10}\)
\(x+\dfrac{3}{7}=\dfrac{4}{10}+\dfrac{3}{10}\)
\(x+\dfrac{3}{7}=\dfrac{7}{10}\)
\(x=\dfrac{7}{10}-\dfrac{3}{7}\)
\(x=\dfrac{49}{70}-\dfrac{30}{70}\)
\(x=\dfrac{19}{30}\)
a) Các phân số tối giản là: \(\dfrac{4}{5};\dfrac{3}{4};\dfrac{11}{13}\)
b) Các phân số bằng phân số \(\dfrac{5}{7}\) là: \(\dfrac{25}{35};\dfrac{100}{140};\dfrac{85}{119}\)
hello
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