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\(460+85\) x \(4=\frac{x+175}{5}+30\)
\(460+340=\frac{x+175}{5}+30\)
\(800=\frac{x+175}{5}+30\\ \frac{x+175}{5}=800-30\\ \frac{x+175}{5}=770\)
\(x+175=770\) x \(5\)
\(x+175=3850\\ x=3850-175\\ x=3675\)
460 - 80 x 4 = ( x + 200) : 4
460 - 340 = (x + 200) : 4
120 = ( x + 200) : 4
x + 200 = 120 x 4
x + 200 = 480
x = 480 - 200
x = 280
Ta có:
\(Coi\) \(A=\left(\frac{1}{10}+\frac{1}{40}+\frac{1}{88}+\frac{1}{154}+\frac{1}{238}+\frac{1}{340}\right).x=1\frac{1}{5}\)
\(=\left(\frac{1}{2.5}+\frac{1}{5.8}+\frac{1}{8.11}+\frac{1}{11.14}+\frac{1}{14.17}+\frac{1}{17.20}\right).x=\frac{6}{5}\)
\(\Rightarrow3A=\left(\frac{3}{2.5}+\frac{3}{5.8}+\frac{3}{8.11}+\frac{3}{11.14}+\frac{3}{14.17}+\frac{3}{17.20}\right).x=\frac{6}{5}.3=\frac{18}{5}\) \(=\left(\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{17}+\frac{1}{17}-\frac{1}{20}\right).x\)
\(=\left(\frac{1}{2}-\frac{1}{20}\right).x\)
\(=\frac{9}{20}.x=\frac{18}{5}\)
\(\Rightarrow x=\frac{18}{5}:\frac{9}{20}=8\)
Vậy \(x=8\).
a) \(0,25x+175\%x=x+\frac{9}{7}\)
\(0,25x+175\%x+x=\frac{9}{7}\)
\(0,25x+\frac{7}{4}x+x=\frac{9}{7}\)
\(\left(0,25+\frac{7}{4}+1\right)x=\frac{9}{7}\)
\(3x=\frac{9}{7}\)
\(x=\frac{9}{7}\div3\)
\(x=\frac{9}{7}\times\frac{1}{3}\)
\(x=\frac{3}{7}\)
vậy \(x=\frac{3}{7}\)
b)\(2x-\frac{3}{2}-x=1\frac{1}{5}\)
\(2x-x=1\frac{1}{5}+\frac{3}{2}\)
\(x=\frac{27}{10}\)
vậy \(x=\frac{27}{10}\)
TÌM X BIẾT :
a)X=\(\frac{-1}{2}\)+\(\frac{3}{4}\)
b)\(\frac{X}{5}\)=\(\frac{5}{6}\)+\(\frac{-19}{30}\)
30%x -x + 5/6 = 3
<=> (30/100).x -x = 3-5/6
<=> (30/100 - 1).x = 13/6
<=> (-7/10).x=13/6
<=> x = 13/6 :(-7/10)
<=> x = -65/21
Vậy x= -65/21
Thông cảm vì mình không biết viết phần số ạ
\(\frac{10.23-30}{10.27+30}=\frac{10.23-10.3}{10.27+10.3}=\frac{10.\left(23-3\right)}{10.\left(27+3\right)}=\frac{10.20}{10.30}=\frac{2}{3}\)
Tham khảo nha !!!
85 * 4 đâu có bằng 460 đâu??
\(85x4=340\)đâu phải 460