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\(1.a,\frac{5}{7}=\frac{5.9}{7.9}=\frac{45}{63};\frac{4}{9}=\frac{4.7}{9.7}=\frac{28}{63}.\)
\(b,\frac{7}{15},\frac{5}{3}=\frac{5.5}{3.5}=\frac{25}{15}\)
\(c,\frac{11}{12}=\frac{11.4}{12.4}=\frac{44}{48};\frac{7}{48}\)
\(d,\frac{3}{2}=\frac{3.3}{2.3}=\frac{9}{6};\frac{2}{3}=\frac{2.2}{3.2}=\frac{4}{6}\)
\(e,\frac{1}{3}=\frac{1.4}{3.4}=\frac{4}{12};\frac{5}{4}=\frac{5.3}{4.3}=\frac{15}{12};\frac{10}{12}\)
\(\frac{1}{2}+\frac{2}{3}+\frac{3}{5}=\frac{3}{6}+\frac{4}{6}+\frac{3}{5}\)
=\(\frac{7}{6}+\frac{3}{5}\)
\(=\frac{35}{30}+\frac{18}{30}=\frac{53}{30}\)
\(\frac{3}{8}+\frac{3}{4}+\frac{1}{16}=\frac{6}{16}+\frac{12}{16}+\frac{1}{16}\)
=\(\frac{18}{16}+\frac{1}{16}\)
\(=\frac{19}{16}\)
a.
x + 4/5 = 4/5 + 36/35
x + 4/5 = 64/35
x = 64/35 - 4/5
x = ......
b.
5/7 + x/35 = 4/5
Ta có :
25/35 + x/35 = 28/35
Suy ra x = 28 - 25
x = 3
3636/4545+x=4848/1515
x=4848/1515-3636/4545
x=14544/4545-3636/4545
x=10908/4545
3535/5050-x=8/25
x=3535/5050-1616/5050
x=1919/5050
b) 1/3+1/3^2+1/3^3+1/3^4+1/3^5 (goi tong bang M)
3M=1+1/3+1/3^2+1/3^3+1/3^4
3M-M=1-1/3^5
2M=242/243
M=242/243*1/2=121/243
a) \(\frac{55}{32}\)
b) \(\frac{90}{48}\)
c) \(\frac{76}{15}\)
d) \(\frac{552}{119}\)
\(\frac{9}{16}+\frac{37}{32}=\frac{18}{32}+\frac{37}{32}=\frac{55}{32}\)
\(\frac{126}{48}-\frac{12}{16}=\frac{21}{8}-\frac{6}{8}=\frac{15}{8}\)
\(\frac{19}{15}\times\frac{32}{8}=\frac{19}{15}\times4=\frac{76}{15}\)
\(\frac{23}{17}:\frac{7}{24}=\frac{23}{17}.\frac{24}{7}=4\frac{76}{119}\)
a, 16/36 = 4/9 > 20/45 > 5/45 > 5/48
=> 16/36 > 5/48
b, 6/31 < 6/30 = 1/5 = 7/35 < 8/35
=> 6/31 < 8/35
c, 12/165 > 10/165 > 10/200 = 1/20 > 1/50 = 9/450
=> 12/165 > 9/450
~~Hok tốt~~
a)16/36>9/72 và 9/72>5/48 =>16/36>5/48
b)6/31<1/5 và 1/5<8/35 => 6/31<8/35
c)12/165>1/15 và 1/15>9/450 => 12/165>9/450
chúc bạn học tốt nha
\(a)\frac{a}{b}\times4+\frac{1}{6}=\frac{17}{6}\)
\(\frac{a}{b}\times4\) \(=\frac{17}{6}-\frac{1}{6}\)
\(\frac{a}{b}\times4\) \(=\frac{8}{3}\)( Đây là kết quả khi rút gọn phân số 16/6 nha )
\(\frac{a}{b}\) \(=\frac{8}{3}\div4\)
\(\frac{a}{b}\) \(=\frac{8}{3}\times\frac{1}{4}\)
\(\frac{a}{b}\) \(=\frac{2}{3}\)
\(b)\frac{4}{5}\div\frac{a}{b}\times2=\frac{16}{5}\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{16}{5}\div2\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{16}{5}\times\frac{1}{2}\)
\(\frac{4}{5}\div\frac{a}{b}\) \(=\frac{8}{5}\)
\(\frac{a}{b}\) \(=\frac{4}{5}\div\frac{8}{5}\)
\(\frac{a}{b}\) \(=\frac{4}{5}\times\frac{5}{8}\)
\(\frac{a}{b}\) \(=\frac{1}{2}\)
Nếu có gì ko hiểu bạn cứ hỏi mik nha.
=5/8:5/4
=1/2 nha