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tính trừ bt nha bạn vế thương thì cũng tĩnh ra xong mới tính nha
a, \(x\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{8}\) = \(\dfrac{7}{12}\)
\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) + \(\dfrac{1}{8}\)
\(x\) = \(\dfrac{17}{24}\)
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x/3 = 14/21
<=> X x 21 = 3 x 14
X x 21 = 42
x = 42 : 21
x = 2
8/40 = 1/x
<=> 8 x X = 40 x 1
8 x X = 40
X = 40 : 8
X = 5
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a) 2115 : x = 21
=> x = 2115 : 21 = \(\frac{705}{7}\) ( sai đề )
b) \(\left(9\times x-21\right):3=2\)
=> \(\left(9\times x-21\right)=2\times3=6\)
=> \(9\times x=6+21=27\)
=> \(x=27:9=3\)
Vậy x = 3
c) 231 + ( 312 - x ) = 531
=> 231 + 312 - x = 531
=>. 543 - x = 531
=> x = 543 - 531 = 12
Vậy x = 12
a) 2115 : x = 21
x= 705/7
b) ( 9 * x - 21) : 3 = 2
9 * x - 21 = 6
9 * x = 27
x = 3
c) 231 + ( 312 - x) = 531
231 + 312 - x = 531
543 - x = 531
x =12
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( x - 3 ) * 5 = 21
x - 3 = 21 : 5
x - 3 = 4,2
x = 4,2 + 3
x = 7,2
cho mình 1 like nha
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\(\left(x-3\right)x5=21\)
\(x-3=\frac{21}{5}\)
\(x=\frac{21}{5}+3\)
\(x=\frac{36}{5}\)
\(tk\)\(cho\)\(mk\)\(nha!\)\(cảm\)\(ơn\)\(@@@@@@@@@@@@@@@@\)
\(\left(x-3\right)=\frac{21}{5}\)
\(x=\frac{21}{5}+3\)
\(x=\frac{36}{5}\)
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a ) \(\frac{x}{21}=\frac{1}{2}\)
\(x=21\times1\div2\)
\(x=10,5\)
b ) \(\frac{2}{x}=\frac{3}{14}\)
\(x=14\times2\div3\)
\(x=9,3333\)
c ) \(\frac{13}{9}=\frac{x}{18}\)
\(x=18\times13\div9\)
\(x=26\)