Bài 1)
\(\dfrac{9}{12}+\dfrac{10}{12}=\dfrac{12}{19}\)
\(\dfrac{50}{54}=\dfrac{27}{25}\)
\(\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
\(\dfrac{8}{5}x\dfrac{4}{3}=\dfrac{32}{15}\)
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Bài 2)
a) \(x=\dfrac{5}{2}-\dfrac{2}{7}\)
\(x=\dfrac{31}{14}\)
b) \(x=\dfrac{6}{7}x\dfrac{4}{5}\)
\(x=\dfrac{24}{35}\)
bài 1.
a , =19/12
b, =25/27
c, = 7/24
d, = 32/15
bài 2:
a:
x=5/2 - 2/7
x=31/14
b:
x=6/7 x 4/5
x=24/35
bài 1:
a,3/4+5/6
=18/24+20/24
=19/12
b,5/18.3/10
=1/12
c,2/3-3/8
=16/24-9/24
=7/24
d,8/5:3/4
=8/5.4/3
=32/15
bài 2:
a,x=5/2-2/7
x=35/14-4/14
x=31/14
b,x=6/7.4/5
x=24/35
bài 1
a)3/4+5/6=18/24+20/24=38/24=19/12
b)5/18x10/3=50/54=25/27
c)2/3-3/8=16/24-9/24=7/24
d)8/5:3/4=32/15
bài 2
a,x=5/2-2/7
x=35/14-4/14
x=31/14
b,x=6/7.4/5
x=24/35
