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\(\frac{3}{10}x\frac{5}{6}=4x\frac{7}{18}=\frac{14}{9}x\frac{9}{14}=1\)
kia là dấu nhân phải ko??
Nếu vậy ta có: (rút gọn từng cái rồi ráp lại cho dễ)
\(\frac{3}{10}\times\frac{5}{6}=\frac{1}{2}\times\frac{1}{2}=\frac{1}{4}\left(rutgoncheo\right)\)
\(\frac{7}{18}\times\frac{9}{14}=\frac{1}{2}\times\frac{1}{2}=\frac{1}{4}\left(rutgoncheo\right)\)
Ráp lại có: \(\frac{1}{4}\times\frac{1}{4}=\frac{1}{16}\)
a) Các phân số tối giản:
\(\frac{1}{5}\text{ };\text{ }\frac{17}{20}\)
b) Rút gọn:
\(\frac{12}{18}=\frac{12\div6}{18\div6}=\frac{2}{3}\)
\(\frac{15}{95}=\frac{15\div5}{95\div5}=\frac{3}{19}\)
a) \(\frac{1}{5}\);\(\frac{17}{20}\)
b) \(\frac{12}{18}\)= \(\frac{2}{3}\);\(\frac{15}{95}\)= \(\frac{3}{19}\)
a) \(\frac{2}{5}+\frac{9}{15}=\frac{2}{5}+\frac{3}{5}=\frac{5}{5}=1\)
b) \(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{7}{6}\)
c) \(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{12}{8}=\frac{3}{2}\)
d) \(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{19}{42}\)
a) \(\frac{2}{5}+\frac{9}{15}\)=\(\frac{2}{5}+\frac{3}{5}=\frac{2+3}{5}=1\)
b)\(\frac{15}{45}+\frac{25}{30}=\frac{1}{3}+\frac{5}{6}=\frac{2}{6}+\frac{5}{6}=\frac{2+5}{6}=\frac{7}{6}\)
c)\(\frac{28}{32}+\frac{45}{72}=\frac{7}{8}+\frac{5}{8}=\frac{7+5}{8}=\frac{12}{8}=\frac{3}{2}\)
d)\(\frac{8}{28}+\frac{5}{30}=\frac{2}{7}+\frac{1}{6}=\frac{12}{42}+\frac{7}{42}=\frac{12+7}{42}=\frac{19}{42}\)
1)
a)15/90 = 1/6, 120/600=1/5, 75/150=1/5 mau so chung=30
1/6=5/30
1/5=6/30
1/5=6/30
b)54/90=3/5, 180/288=5/8, 60/135=4/9
3/5=3*8*9/5*8*9=216/360
5/8=5*5*9/5*8*9=225/360
4/9=4*8*5/5*8*9=160/360
bai 2 ban tu lam di,mk met roi
\(\frac{8}{5}-\frac{18}{27}\)
\(=\frac{8}{5}-\frac{2}{3}\)
\(=\frac{24}{15}-\frac{10}{15}\)
\(=\frac{14}{15}\)
\(\frac{12}{20}-\frac{6}{18}\)
\(=\frac{3}{5}-\frac{1}{3}\)
\(=\frac{9}{15}-\frac{5}{15}\)
\(=\frac{4}{15}\)
\(\frac{8}{24}-\frac{5}{25}\)
\(=\frac{1}{3}-\frac{1}{5}\)
\(=\frac{5}{15}-\frac{3}{15}\)
\(=\frac{2}{15}\)
\(\frac{18}{21}-\frac{12}{27}\)
\(=\frac{6}{7}-\frac{4}{9}\)
\(=\frac{54}{63}-\frac{28}{63}\)
\(=\frac{26}{63}\)
1)8/5-2/3=14/15
2)3/5-1/3=4/15
3)1/3-1/5=2/15
4)6/7-4/9=26/63
1.
a) \(\frac{16}{24}-\frac{1}{3}=\frac{16}{24}-\frac{8}{24}=\)\(\frac{8}{24}=\frac{1}{3}\)
b) \(\frac{4}{5}-\frac{12}{60}=\frac{48}{60}-\frac{12}{60}=\frac{36}{60}=\frac{9}{15}\)
3.
a)\(\frac{17}{6}-\frac{2}{6}=\frac{17-2}{6}=\frac{15}{6}\)
b) \(\frac{16}{15}-\frac{11}{15}=\frac{16-11}{15}=\frac{5}{15}=\frac{1}{3}\)
c) \(\frac{19}{12}-\frac{13}{12}=\frac{19-13}{12}=\frac{6}{12}=\frac{1}{2}\)
a) 16 24 − 1 3 = 16 24 − 8 24 = 24 16 − 3 1 = 24 16 − 24 8 = 8 24 = 1 3 24 8 = 3 1 b) 4 5 − 12 60 = 48 60 − 12 60 = 36 60 = 9 15 5 4 − 60 12 = 60 48 − 60 12 = 60 36 = 15 9 3. a) 17 6 − 2 6 = 17 − 2 6 = 15 6 6 17 − 6 2 = 6 17−2 = 6 15 b) 16 15 − 11 15 = 16 − 11 15 = 5 15 = 1 3 15 16 − 15 11 = 15 16−11 = 15 5 = 3 1 c) 19 12 − 13 12 = 19 − 13 12 = 6 12 = 1 2 12 19 − 12 13 = 12 19−13 = 12 6 = 2 1
1/3va 4/7va72/73 toi gian vi no ko chia duoc cho so nao het
8/12va30/36 chua tối giản vì nó còn chia được cho 2 và 3
\(a,\frac{15}{18}=\frac{5}{6}\)
\(b,\frac{144}{351}=\frac{16}{39}\)
\(c,\frac{6}{30}=\frac{1}{5}\)
\(d,\frac{2005}{3000}=\frac{401}{600}\)
a) \(\frac{15}{18}=\frac{5}{6}\)
b) \(\frac{144}{351}=\frac{16}{39}\)
c) \(\frac{6}{30}=\frac{1}{5}\)
d) \(\frac{2005}{3000}=\frac{401}{600}\)