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\(\dfrac{4\times x}{1\times5}\) + \(\dfrac{4\times x}{5\times9}\) + \(\dfrac{4\times x}{9\times13}\) + \(\dfrac{4\times x}{13\times17}\) = 16
\(x\times\left(\dfrac{4}{1\times5}+\dfrac{4}{5\times9}+\dfrac{4}{9\times13}+\dfrac{4}{13\times17}\right)\) = 16
\(x\) \(\times\) (\(\dfrac{1}{1}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{9}\) + \(\dfrac{1}{9}\) - \(\dfrac{1}{13}\) + \(\dfrac{1}{13}\) - \(\dfrac{1}{17}\)) = 16
\(x\) \(\times\) ( \(\dfrac{1}{1}\) - \(\dfrac{1}{17}\)) = 16
\(x\) \(\times\) \(\dfrac{16}{17}\) = 16
\(x\) = 16 : \(\dfrac{16}{17}\)
\(x\) = 17
đổi 75%=3/4.Ta có:
3/4xX+3/4xX+X=30
(3/4+3/4+1)xX=30
5/2 x X=30
X = 30:5/2
X = 12
\(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+1\times x=30\)
\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)
\(\frac{5}{2}\times x=30\)
\(x=30\div\frac{5}{2}\)
\(x=12\)
0,75 x X + 0,75 x X + X = 30
X x ( 0,75 + 0,75 + 1 ) = 30
X x 2,5 = 30
X = 30 : 2,5
X = 12
75%xX+3/4xX+X=30
<=>3/4xX+3/4xX+X=30
<=>10/4xX=30
<=>10xX=120
<=>X=120/10=12
Vậy X=12
( 4 x X - 0.8 ) : X + 14.5 = 16
( 4 x X - 0.8 ) : X = 16 - 14.5
4 x X - 0.8 = 1.5 x X
4 x X - 1.5 x X = 0.8
( 4 - 1.5 ) x X = 0.8
2.5 x X = 0.8
X = 0.8 : 2.5
X = 0.32
= 75% x X + 3/4 x X + X = 30
= X x (3/4 + 3/4 + 1) = 30
= X x 10/4 = 30
= X = 30 : 10/4
X = 12
`4 xx x -x-x=1,07`
`=> 4 xx x - x xx 1 - x xx 1=1,07`
`=> (4-1-1) xx x=1,07`
`=> 2 xx x =1,07`
`=> x=1,07 : 2`
`=>x=0,535`
`4xx x-x-x=107`
`=>x xx (4-1-1)=1,07`
`=> x xx 2=1,07`
`=>x=1,07:2`
`=>x=0,535`