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a, \(\dfrac{20}{15}=\dfrac{4}{3}\)
b, \(\dfrac{6}{15}=\dfrac{2}{5}\)
c, \(\dfrac{42}{30}=\dfrac{7}{5}\)
d, \(\dfrac{40}{35}=\dfrac{8}{7}\)
e, \(\dfrac{42}{42}=1\)
g, \(\dfrac{54}{10}=\dfrac{27}{5}\)
h, \(\dfrac{12}{15}\)
a) 2/3 x 3/2 = 1
b) 4/7 x 7/4 = 1
c) 1/2 x 2/1 = 1
\(\frac{5}{7}:x=\frac{2}{3}x\frac{3}{4}\)
\(\frac{5}{7}:x=\frac{1}{2}\)
\(x=\frac{5}{7}:\frac{1}{2}\)
\(x=\frac{10}{7}\)
a: =9/11(7/4+5/4)=9/11x3=27/11
b: \(=\dfrac{28}{5}\cdot\dfrac{5}{8}\cdot\dfrac{5}{4}=\dfrac{28}{8}\cdot\dfrac{5}{4}=\dfrac{140}{32}=\dfrac{35}{8}\)
c: \(=\dfrac{2}{6}+\dfrac{4}{5}\cdot\dfrac{6}{5}-\dfrac{2}{5}=\dfrac{67}{75}\)
a,=(7/4+5/4):11/9
=3:11/9
=27/11
b,=28/5.5/4.5/8
=7.5/8
=35/8
c,=1/3+24/25-2/5
=97/75-2/5
=67/75
1/2
\(\dfrac{2}{3}\times\dfrac{3}{4}=\dfrac{6}{12}=\dfrac{1}{2}\)