4xX-X-X=1,07
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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
`4xx x+x=250`
`=>x xx (4+1)=250`
`=>x xx 5=250`
`=> x =250:5`
`=>x=50`
4 \(\times\) \(x\) + \(x\) = 250
4 \(\times\) \(x+x\times1\) = 250
\(x\times\) ( 4 + 1) = 250
\(x\times\) 5 = 250
\(x\) = 250 : 5
\(x\) = 50
\(\frac{3}{8}\times x+\frac{1}{4}\times x=\frac{2}{5}\)
\(\Rightarrow x\times\left(\frac{3}{8}+\frac{1}{4}\right)=\frac{2}{5}\)
\(\Rightarrow x\times\frac{5}{8}=\frac{2}{5}\)
\(\Rightarrow x=\frac{16}{25}\)
~Std well~
#Thạc_Trân
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
\(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+1\times x=30\)
\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)
\(\frac{5}{2}\times x=30\)
\(x=30\div\frac{5}{2}\)
\(x=12\)
1/4 . x - (x - 4/5) - 1/2 = 2x - 6
1/4 x - x + 4/5 - 1/2 = 2x - 6
1/4 x - x - 2x = -6 - 4/5 + 1/2
-11/4 x = -63/10
x = -63/10 : (-11/4)
x = 126/55
\(11\left(x-6\right)-4x=11\)
\(\Rightarrow11x-66-4x=11\)
\(7x=11+66=77\Rightarrow x=11\)
11.(x-6) - 4.x=11 (chương trình thcs nhân là chấm nha)
11x-66-4x=11 (lấy 11 nhân vs x và 6)
7x=11+66 (chuyển vế là dc nha)
7x=77
x=11
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 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`