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2/9 : 2/3 x 1/2 = 2/9 x 3/2 x 1/2 = 1/6
1/2 x 1/3 + 1/4 = 1/6 + 1/4 = 5/12
2/7 : 2/3 - 1/7 = 2/7 x 3/2 - 1/7 = 3/7 - 1/7 = 2/7
\(x\): \(\dfrac{2}{3}\) + \(\dfrac{1}{7}\) = \(\dfrac{2}{7}\)
\(x\) : \(\dfrac{2}{3}\) = \(\dfrac{2}{7}\) - \(\dfrac{1}{7}\)
\(x\): \(\dfrac{2}{3}\) = \(\dfrac{1}{7}\)
\(x\) = \(\dfrac{1}{7}\) \(\times\) \(\dfrac{2}{3}\)
\(x\) = \(\dfrac{2}{21}\)
b, \(x\times\dfrac{1}{5}\) + \(x\) \(\times\)\(\dfrac{4}{5}\) = 2
\(x\) \(\times\) ( \(\dfrac{1}{5}\) + \(\dfrac{4}{5}\)) = 2
\(x\) \(\times\) \(\dfrac{5}{5}\) = 2
\(x\) \(\times\) 1 = 2
\(x\) = 2 : 1
\(x\) = 2
\(x\div\dfrac{1}{7}=\dfrac{2}{7}\) \(x\times\dfrac{1}{5}+x\times\dfrac{4}{5}=2\)
\(x=\dfrac{2}{7}\times\dfrac{1}{7}\) \(x\times\left(\dfrac{1}{5}+\dfrac{4}{5}\right)=2\)
\(x=\dfrac{3}{7}\) \(x\times\dfrac{5}{5}=2\)
\(x=2\div1\)
\(x=2\)
# Ninh OSS
x*3/7=2/5
=>x=2/5:3/7=2/5*7/3=14/15
3/7:x=1/2
=>x=3/7:1/2=6/7
7/5-x=2/3
=>x=7/5-2/3=21/15-10/15=11/15
a) 2/7 X x = 2/3
X = 2/3 : 2/7
X = 7/3
b) 2/5 : x = 1/3
X = 2/5 : 1/3
X = 6/5
c) x : 7/11 = 22
X = 22 x 7/11
X = 14
d) 1/2 : x = 5
X = 1/2 : 5
X = 1/10
a) \(\dfrac{2}{7}\times x=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}\div\dfrac{2}{7}\)
\(x=\dfrac{7}{3}\)
b) \(\dfrac{2}{5}:x=\dfrac{1}{3}\)
\(x=\dfrac{2}{5}:\dfrac{1}{3}\)
\(x=\dfrac{6}{5}\)
c) \(x:\dfrac{7}{11}=22\)
\(x=22\times\dfrac{7}{11}\)
\(x=\dfrac{154}{11}\)
\(x=14\)
d) \(\dfrac{1}{2}:x=5\)
\(x=\dfrac{1}{2}:5\)
\(x=\dfrac{1}{10}\)
a) X=3/18
b)X=13/10
c)X=11/15
d)X=8/35
e)X=37/21
f)X=65/36
g)X=1/4
h)X=5/4
i)X=7/5
k)X=5/14
l)X=167/96
có nhiều bài khó nếu em ko bik thì kb với cj để cj giúp nha.
a)3/8
b) 13/10
c) 11/15
d) 8/35
e) 37/21
f) 65/36
g) 1/4
h) 5/4
i) 7/5
k) 5/14
l) 167/96
-HT- :)))))))
1) 1/3 x 1/2 x 3/7 = 1/6 x 3/7 = 1/14
2) 5/4 x 1/3 + 1/7 = 5/12 + 1/7 = 47/84
3) 8 x (8/9 - 2/3) = 8 x 2/9 = 16/9
4) 5/6 x 48/20 x 1/2 = 2 x 1/2 = 1
5) (2/5 + 3/4) x 8 = 23/20 x 8 = 46/5
6) 10 x (1/2 - 1/5) = 10 x 3/10 = 3
a) 2 + 1/3 - x = 1 + 1/4
7/3 -x = 5/4
x = 7/3 - 5/4
x = 13/12
b) (2/7 x 2) : x = 1 :7/2
4/7 : x = 2/7
x = 4/7 : 2/7
x = 2
a) 2 + 1/3 - x = 1 + 1/4
7/3 -x = 5/4
x = 7/3 - 5/4
x = 13/12
b) (2/7 x 2) : x = 1 :7/2
4/7 : x = 2/7
x = 4/7 : 2/7
x = 2
\(\frac{1}{2}\times\frac{2}{7}=\frac{1}{7}\)
\(\frac{1}{2}\times\frac{2}{7}=\frac{1\times2}{2\times7}=\frac{1}{7}.\)