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\(\frac{25-x}{18}=\frac{1}{2}\)
\(\frac{25-x}{18}=\frac{9}{18}\)
\(25-x=9\)
\(x=25-9\)
\(x=16\)
\(\frac{5x+15}{275}=\frac{4}{35}\)
\(\Rightarrow35\times\left(5x+15\right)=275\times4\)
\(\Rightarrow35\times\left(5x+15\right)=1100\)
\(\Rightarrow5x+15=1100:35\)
\(\Rightarrow5x+15=\frac{220}{7}\)
\(\Rightarrow5x=\frac{220}{7}-15\)
\(\Rightarrow5x=\frac{115}{7}\)
\(\Rightarrow x=\frac{115}{7}:5\)
\(\Rightarrow x=\frac{23}{7}\)
\(3,6< x< 3,7\)
\(\Rightarrow x=3,61;3,62;3,63;3,64;3,65\)
25 - x / 56 = 6/16
( 25 - x ) : 56 = 6/16
25 - x = 6/16 x 56
25 - x = 21
x = 25 - 21
x = 4
\(\frac{25-x}{56}=\frac{6}{16}\)
\(\frac{x}{56}=25-\frac{6}{16}\)
\(\frac{x}{56}=24\frac{5}{8}\)
\(\frac{x}{56}=24\frac{35}{56}\)
\(\frac{x}{56}=\frac{24\cdot56+35}{56}\)
\(\frac{x}{56}=\frac{1379}{56}\)
Vậy số cần tìm là \(1379\)
\(\left(x+\frac{1}{4}\right)^2+\frac{11}{25}=\frac{18}{25}\)
\(\Rightarrow\left(x+\frac{1}{4}\right)^2=\frac{7}{25}\)
\(\Rightarrow x+\frac{1}{4}=\hept{\begin{cases}\sqrt{\frac{7}{25}}\\-\sqrt{\frac{7}{25}}\end{cases}}\)
\(\Rightarrow x=\hept{\begin{cases}\sqrt{\frac{7}{25}}-\frac{1}{4}\\-\sqrt{\frac{7}{25}}-\frac{1}{4}\end{cases}}\)
\(a.\) \(25,4-\frac{1}{4}\div x+1250\%=37,5\)
\(25,4-0.25\div x+12,5=37,5\)
\(25,4-0,25\div x=37,5-12,5\)
\(25,4-0,25\div x=25\)
\(0,25\div x=25,4-25\)
\(0,25\div x=0,4\)
\(x=0,25\div0,4\)
\(x=0,625\)
\(b.\)\(3\frac{1}{8}\div\left(\frac{2}{5}-x\right)\times\frac{8}{25}=3\)
\(\frac{3\times8+1}{8}\div\left(\frac{2}{5}-x\right)=3\div\frac{8}{25}\)
\(\frac{25}{8}\div\left(\frac{2}{5}-x\right)=\frac{75}{8}\)
\(\frac{2}{5}-x=\frac{25}{8}\div\frac{75}{8}\)
\(\frac{2}{5}-x=\frac{25}{8}\times\frac{8}{75}\)
\(\frac{2}{5}-x=\frac{1}{3}\)
\(x=\frac{2}{5}-\frac{1}{3}=\frac{6}{15}-\frac{5}{15}\)
\(x=\frac{1}{15}\)
a)25,4-\(\frac{1}{4}\): x +1250%=37,5
25,4 - 0,25 : x + 12,5 = 37,5
25,4 - 0,25 : x =37,5 -12,5
25,4 - 0,25 : x = 25
0,25 : x = 25,4 -25
0,25 : x = 0,4
x = 0,25;0,4
x = 0,625
b) \(3\frac{1}{8}:\left(\frac{2}{5}-x\right)\times\frac{8}{25}=3\)
\(3,125:\left(0,4-x\right)\times0,32=3\)
\(3,125:\left(0,4-x\right)=3:0,32\)
\(3,125:\left(0,4-x\right)=9,375\)
\(0,4-x=3,125:9,375\)
\(0,4-x=\frac{1}{3}\)
\(x=0,4-\frac{1}{3}\)
\(x=\frac{1}{15}\)
\(\left(25-x\right).2=18.1\)
\(\left(25-x\right).2=18\)
\(\left(25-x\right)=18:2\)
\(25-x=9\)
\(x=25-9\)
\(x=16\)
vậy x = 16
nha
\(\frac{25-x}{18}=\frac{1}{2}\)
\(=>\left(25-x\right).2=18\)
\(=>50-2x=18\)
\(\Rightarrow-2x=50-18\)
\(\Rightarrow-2x=32\)
\(\Rightarrow x=-16\)
vay \(x=-16\)
\(\frac{25-x}{18}=\frac{1}{2}\)
\(\frac{25-x}{18}=\frac{9}{18}\)
\(25-x=9\)
\(x=25-9\)
\(x=16\)
\(\frac{25-x}{18}=\frac{1}{2}\)
\(\frac{25-x}{18}=\frac{9}{18}\)
\(\Rightarrow25-x=9\)
\(x=25-9\)
\(x=16\)