7-[x-3]=14:7
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7 x 2 = 14 7 x 4 = 28 7 x 6 = 42 7 x 3 = 21
2 x 7 = 14 4 x 7 = 28 6 x 7 = 42 3 x 7 = 21
14 : 7 = 2 28 : 7 = 4 42 : 7 = 6 21 : 7 = 3
14 : 2 = 7 28 : 4 = 7 42 : 6 = 7 21 : 3 = 7
9/5 : 7/4 + 3/4 x 8/7
= (9/5 : 8/7) x (7/4 + 3/4)
= 63/40 x 5/2
= 63/16
7 x 3/14 - 1/14
= 3/2 - 1/4
= 5/4
\(\dfrac{9}{5}:\dfrac{7}{4}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{9}{5}\times\dfrac{4}{7}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{36}{35}+\dfrac{6}{7}\)
\(=\dfrac{66}{35}\)
\(7\times\dfrac{3}{14}-\dfrac{1}{14}\)
\(=\dfrac{3}{2}-\dfrac{1}{14}\)
\(=\dfrac{10}{7}\)
4/5 x 15/11 x 2/9 = 8/33
4/7 x 2/5 + 4/7 x 3/5 = 4/7
( 5/7 + 7/8 ) x 2 = 89/28
2/14 + 3/7 - 3/14 x 2 = 1/7
tk mình nhé, mk nhanh nhất
a: \(2^7+\left(x-3^7\right)=5^7-4^7\)
=>\(128+x-2187=78125-16384\)
=>\(x-2059=61741\)
=>\(x=61741+2059=63800\)
c: \(7^2-\left(x+15\right)=5\cdot2^2\)
=>49-(x+15)=5*4=20
=>x+15=29
=>x=14
d: 7^3-7(13-x)=14
=>343-7(13-x)=14
=>7(13-x)=343-14=329
=>13-x=47
=>x=13-47=-34
a: x+3/7=7/6
=>x=7/6-3/7=49/42-18/42=31/42
b: 12/7-x=5/14
=>x=12/7-5/14=24/14-5/14=19/14
a.\(x+\dfrac{3}{7}=\dfrac{7}{6}\)
\(x=\dfrac{7}{6}-\dfrac{3}{7}\)
\(x=\dfrac{49-18}{42}=\dfrac{31}{42}\)
b.\(\dfrac{12}{7}-x=\dfrac{5}{14}\)
\(x=\dfrac{12}{7}-\dfrac{5}{14}\)
\(x=\dfrac{24-5}{14}=\dfrac{19}{14}\)
( 2 x y + 2/15 ) x 3 = 4/5
( 2 x y + 2/15 ) = 4/5 : 3
( 2 x y + 2/15 ) = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 :2
y = 1/15
(2 x y + 2/15) x 3 = 4/5
2 x y + 2/15) = 4/5 : 3
2 x y + 2/15 = 4/15
2 x y = 4/15 - 2/15
2 x y = 2/15
y = 2/15 : 2
y = 1/15
7/9 x (2 - 1/3 x y) = 14/15
(2 - 1/3 x y) = 14/15 : 7/9
(2 - 1/3 x y) = 6/5
2 - y = 6/5 x 1/3
2 - y = 2/5
y = 2/5 + 2
y = 12/5
4/21 + 5 x y - 8/7 = 1/3
4/21 + 5 x y = 1/3 + 8/7
4/21 + 5 x y = 31/21
5 x y = 31/21 - 4/21
5 x y = 9/7
y = 9/7 : 5
y = 9/35
7/12 x y - 3/12 x y = 5
y x (7/12 - 3/12) = 5
y x 1/3 = 5
y = 5 : 1/3
y = 15
a: \(=3\cdot\dfrac{6+14-9}{42}\cdot\dfrac{14}{11}\)
\(=3\cdot\dfrac{11}{42}\cdot\dfrac{14}{11}=1\)
b: \(=\dfrac{19}{5}\cdot\dfrac{11}{10}+\dfrac{9}{5}\cdot\dfrac{7}{3}\)
\(=\dfrac{209}{50}+\dfrac{63}{15}=4.18+4.2=8,38\)
\(\frac{3}{7}\times\frac{14}{3}+\frac{3}{7}\times\frac{7}{3}\)
\(=\frac{3}{7}\times\left(\frac{14}{3}+\frac{7}{3}\right)\)
\(=\frac{3}{7}\times7\)
\(=\frac{21}{7}=3\)
Vậy : \(\frac{3}{7}\times\frac{14}{3}+\frac{3}{7}\times\frac{7}{3}=3\)
7-(x-3)=2
x-3=7-2
x-3=5
x =5+3
x =7
Vậy x=7
7 - (x - 3) = 14 : 7
7 - (x - 3) = 2
x - 3 = 7 - 2
x - 3 = 5
x = 5 + 3
x = 8
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