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a, -(-12) => +9 => |-6| => -|-5-| => 0 => -4
b, |+7| => 4 => -(-3) => |-1| => 0 => -(+2) => +(-5) => -8
a, \(\frac{7}{39};\frac{11}{65};\frac{9}{52}\)
Ta có: 39 = 3.13: 65 = 5.13; 52 = 22 .13
=> BCNN(39;65;52) = 22.3.5.13 = 780
=> MSC là 780
Quy đồng:
\(\frac{7}{39}=\frac{7\cdot20}{39\cdot20}=\frac{140}{780}\)
\(\frac{11}{65}=\frac{11\cdot12}{65\cdot12}=\frac{132}{780}\)
\(\frac{9}{52}=\frac{9\cdot15}{52\cdot15}=\frac{135}{780}\)
=> Sắp xếp theo thứ tự tăng dần: \(\frac{11}{65};\frac{9}{52};\frac{7}{39}\)
b, \(\frac{17}{20};\frac{-19}{36};\frac{38}{45};\frac{-13}{18}\)
Ta có: 20 = 22.5; 36 = 22.32; 45 = 32.5; 18 = 2.32
=> BCNN(20; 36; 45; 18) = 22.32.5 = 180
=> MSC là 180
Quy đồng:
\(\frac{17}{20}=\frac{17\cdot9}{20\cdot9}=\frac{153}{180}\)
\(\frac{-19}{36}=\frac{-19\cdot5}{36\cdot5}=\frac{-95}{180}\)
\(\frac{38}{45}=\frac{38\cdot4}{45\cdot4}=\frac{152}{180}\)
\(\frac{-13}{18}=\frac{-13\cdot10}{18\cdot10}=\frac{-130}{180}\)
=> Sắp xếp theo thứ tự tăng dần: \(\frac{-13}{18};\frac{-19}{36};\frac{38}{45};\frac{17}{20}\)
Chúc bạn học tốt!!!
\(\frac{7}{10}< \frac{6}{7}< \frac{48}{55}< \frac{12}{11}< \frac{8}{7}< \frac{7}{5}< \frac{3}{2}< \frac{9}{4}\)
11/12 ; 27/28 ; 3/4 ; 98/99 ; 2/3
=2451/2772;2673/2772;2079/2772 ;2744/2772;1848/2772
=>1848/2772<2079/2772 <2451/2772<2673/2772<2744/2772
vậy 2/3<3/4<11/12<27/28<98/99
Sắp xếp các phân số sau theo thứ tự tăng dần
11/12 ; 27/28 ; 3/4 ; 98/99 ; 2/3
trả lời:
thứ tự từ tăng dần: 2/3 ; 3/4 ; 11/12 ; 27/28 ; 99/99
Bài 1:
\(\frac{3}{5}+\frac{4}{15}=\frac{9}{15}+\frac{4}{15}=\frac{13}{15}\)
\(\frac{5}{6}:\frac{-7}{12}=\frac{5}{6}.\frac{-12}{7}=\frac{-60}{42}=\frac{-10}{7}\)
\(\frac{-21}{24}:\frac{-14}{8}=\frac{-21}{24}.\frac{-8}{14}=\frac{168}{336}=\frac{1}{2}\)
\(\frac{4}{5}:\frac{-8}{15}=\frac{4}{5}.\frac{-15}{8}=\frac{-60}{40}=\frac{-3}{2}\)
\(\frac{5}{12}-\frac{-7}{6}=\frac{5}{12}+\frac{7}{6}=\frac{5}{12}+\frac{14}{12}=\frac{19}{12}\)
\(\frac{-15}{16}.\frac{8}{25}=\frac{-120}{400}=\frac{-3}{10}\)
Bài 2 :
\(6\frac{4}{5}-\left(1\frac{2}{3}+3\frac{4}{5}\right)\)
\(=\frac{34}{5}-\left(\frac{5}{3}+\frac{19}{5}\right)\)
\(=\frac{34}{5}-\frac{5}{3}-\frac{19}{5}\)
\(=\left(\frac{34}{5}-\frac{19}{5}\right)-\frac{5}{3}\)
\(=3-\frac{5}{3}\)
\(=\frac{4}{3}\)
\(6\frac{5}{7}-\left(1\frac{2}{3}+2\frac{5}{7}\right)\)
\(=\frac{47}{7}-\left(\frac{5}{3}+\frac{19}{7}\right)\)
\(=\frac{47}{7}-\frac{5}{3}-\frac{19}{7}\)
\(=\left(\frac{47}{7}-\frac{19}{7}\right)-\frac{5}{3}\)
\(=4-\frac{5}{3}\)
\(=\frac{7}{3}\)
\(\frac{4}{19}.\frac{-3}{7}+\frac{-3}{7}.\frac{15}{19}+\frac{5}{7}\)
\(=\left(\frac{4}{19}+\frac{15}{19}\right).\frac{-3}{7}+\frac{5}{7}\)
\(=1.\frac{-3}{7}+\frac{5}{7}\)
\(=\frac{-3}{7}+\frac{5}{7}\)
\(=\frac{2}{7}\)
\(\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}\)
\(=\frac{5}{9}.\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)\)
\(=\frac{5}{9}.1\)
\(=\frac{5}{9}\)
Ta có
9/-81=-9/81
Vì -8/9 < -6/7 < -9/81 < 3/4 < 5/6
=> Thứ tự tăng dần là : -8/9 ; -6/7 ; 9/-81 ; 3/4 ; 5/6
Chúc bn hok tốt!
-9/81;-8/9;-6/7;3/4;5/6