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A) \(\dfrac{5}{10}-\dfrac{2}{15}\)
\(=\dfrac{1}{2}-\dfrac{2}{15}\)
\(=\dfrac{15}{30}-\dfrac{4}{30}\)
\(=\dfrac{11}{30}\)
B)\(\dfrac{5}{20}-\dfrac{1}{6}\)
\(=\dfrac{1}{4}-\dfrac{1}{6}\)
\(=\dfrac{6}{24}-\dfrac{4}{24}\)
\(=\dfrac{2}{24}=\dfrac{1}{12}\)
C) \(\dfrac{6}{18}-\dfrac{6}{24}\)
\(=\dfrac{1}{3}-\dfrac{1}{4}\)
\(=\dfrac{4}{12}-\dfrac{3}{12}\)
\(=\dfrac{1}{12}\)
D) \(\dfrac{5}{9}-\dfrac{3}{12}\)
\(=\dfrac{5}{9}-\dfrac{1}{4}\)
\(=\dfrac{20}{36}-\dfrac{9}{36}\)
\(=\dfrac{11}{36}\).
a: =1/2-2/15
=15/30-4/30
=11/30
b: =1/4-1/6
=3/12-2/12
=1/12
c: =1/3-1/4
=1/12
d: =20/36-9/36
=11/36
a) 72/45 x 35/36= 8/5 x 35/36 =280/180=14/9.
b)1/2:3/4+1/6:3/4 =(1/2+1/6) : 3/4 =8/12:3/4 = 24/36=2/3
c) 2/3x4/5+1/3=2/3+1/3x4/5+1/3=4/3x4/15=16/45.
Nếu sai thông cảm cho mình nhé. Bạn ko k cũng ko sao đâu.
Tham khảo :
(Tại mik lười ko mún ghi nên bạn tham khảo cái ảnh này nhá)
\(\frac{3}{15}\)-\(\frac{5}{35}\)=\(\frac{1}{5}\)-\(\frac{1}{7}\)=\(\frac{2}{35}\)
\(\frac{18}{27}\)-\(\frac{2}{6}\)=\(\frac{2}{3}\)-\(\frac{1}{3}\)=\(\frac{1}{3}\)
\(\frac{15}{25}\)-\(\frac{3}{21}\)=\(\frac{3}{5}\)-\(\frac{1}{7}\)=\(\frac{16}{35}\)
\(\frac{24}{36}\)-\(\frac{6}{12}\)=\(\frac{2}{3}\)-\(\frac{1}{2}\)=\(\frac{1}{6}\)
3/15-5/35=2/35
18/27-2/6=1/3
15/25-3/21=16/35
24/36-6/12=1/6
24/18 + 1/3
= 4/3 + 1/3
= 5/3
35/21 + 12/18
= 5/3 + 2/3
= 7/3
75/20 + 27/36
= 15/4 + 3/4
= 18/4
=9/2
3/9 + 1/3 + 15/45
=1/3 + 1/3 + 1/3
= 1/3 x3
= 1