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a: \(x\cdot\dfrac{2}{5}+\dfrac{1}{2}\cdot x=9\)
=>\(x\left(\dfrac{2}{5}+\dfrac{1}{2}\right)=9\)
=>\(x\cdot\dfrac{9}{10}=9\)
=>\(x=9:\dfrac{9}{10}=10\)
b: \(\dfrac{1}{9}:x+\dfrac{3}{9}:x=\dfrac{5}{7}\)
=>\(\left(\dfrac{1}{9}+\dfrac{3}{9}\right):x=\dfrac{5}{7}\)
=>\(\dfrac{4}{9}:x=\dfrac{5}{7}\)
=>\(x=\dfrac{4}{9}:\dfrac{5}{7}=\dfrac{4}{9}\cdot\dfrac{7}{5}=\dfrac{28}{45}\)
a\()\) 1/2 x 2/3 : 5/6 x 5/6
=2/6 : 35/36
=1/3 x 36/35
=36/105=12/35
b\()\)11x15x56/6x35x38
=165x56/6x35x38
=9240/6x35x38
=1540x35x38
=53900x38
=2,048,200
c\()\) 2/7 x 7/5 + 2/7 - 2/7 x 6/5
=2/7x\(\left(\dfrac{7}{5}-\dfrac{2}{7}\right)\)+2/7
=2/7 x 39/35 + 2/7
=2/7 x \(\left(\dfrac{39}{35}+1\right)\)
=2/7 x 74
=148/7
a, \(\Leftrightarrow x=1-\dfrac{2}{9}=\dfrac{7}{9}\)
b, \(\Leftrightarrow x=\dfrac{22.7}{11}=2.7=14\)
1/3x-2/5(x+1)=0
1/3x-2/5x-2/5=0
-1/15x-2/5=0
-1/15x=6/15
x=-6
a) \(\frac{3}{5}\times x=\frac{4}{7}\)
\(x=\frac{4}{7}:\frac{3}{5}\)
\(x=\frac{20}{21}\)
b) \(\frac{1}{8}:x=\frac{1}{5}\)
\(x=\frac{1}{8}:\frac{1}{5}\)
\(x=\frac{5}{8}\)
k nha
a)x=\(\frac{4}{7}:\frac{3}{5}\)
x=20/21
b) x=\(\frac{1}{8}:\frac{1}{5}\)
=>x=5/8
k to di mà
a) \(\left(\frac{1}{3}+\frac{1}{5}\right)\times x=\frac{8}{25}\)
\(\frac{8}{15}\times x=\frac{8}{25}\)
\(x=\frac{8}{25}:\frac{8}{15}\)
\(x=\frac{3}{5}\)
Vậy x = 3/5
b) \(\frac{1}{2}:\frac{4}{5}:x=\frac{7}{3}\)
\(\frac{5}{8}:x=\frac{7}{3}\)
\(x=\frac{5}{8}:\frac{7}{3}\)
\(x=\frac{15}{56}\)
Vậy x = 15/36
ủng hộ tớ nha. thank you nhìu
a) (1/3 + 1/5) . x = 8/25
(5/15 + 3/15) . x = 8/25
=> 8/15 . x = 8/25
x = 8/25 : 8/15
x = 3/5
Vậy x = 3/5
làm thế nào bạn ra kết quả như vậy năng
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- :)))))))
2005x2007-7
=4024035-7
=4024028
2005x2006+1998
=4022030+1998
=4024028