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a)Ta có: \(\frac{x.5}{x}=5\)
\(\Rightarrow\frac{x}{x}.5=5\)
\(\Rightarrow\frac{x}{x}=5:5=1\)
\(\Rightarrow\) với mọi giá trị, x đều thỏa mãn cho điều kiện \(\frac{x}{x}=1\)
b)\(\frac{x}{x.3}=\frac{1}{3}\)
\(\Rightarrow\frac{x}{x}.\frac{1}{3}=\frac{1}{3}\)
\(\Rightarrow\frac{x}{x}=\frac{1}{3}:\frac{1}{3}=\frac{1}{3}.3=1\)
\(\Rightarrow\)với mọi giá trị, x đều thỏa mãn cho điều kiện \(\frac{x}{x}=1\)
\(320\div x-10=5\cdot48\div24\)
\(320\div x-10=240\div24\)
\(320\div x-10=10\)
\(320\div x=10+10\)
\(320\div x=20\)
\(x=320\div20\)
\(x=16\)
gạch tất cả số 5, 9, 13
là bằng 4.x/1 + 4.x/17
rồi gợi ý thế thôi nhé
\(\frac{4.x}{1.5}+\frac{4.x}{5.9}+\frac{4.x}{9.13}+\frac{4.x}{13.17}=16\)
\(x.\left(\frac{4}{1.5}+\frac{4}{5.9}+\frac{4}{9.13}+\frac{4}{13.17}\right)=16\)
\(x.\left(1-\frac{1}{5}+\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}\right)=16\)
\(x.\left(1-\frac{1}{17}\right)=16\)
\(x.\frac{16}{17}=16\Rightarrow x=16:\frac{16}{17}=16.\frac{17}{16}\)
\(\Rightarrow x=17\)
\(\frac{24+x}{50+x}=\frac{3}{5}\)
Ta có : ( 24 + x ) * 5 = ( 50 + x ) * 3
24 * 5 + x * 5 = 50 * 3 + x * 3
120 + x * 5 = 150 + x * 3
x * 5 - x * 3 = 150 - 120
x * 2 = 30
x = 30 / 2
x = 15 k mk nha~~
a) \(\frac{24}{x}\div\frac{8}{3}=\frac{3}{5}\)
\(\frac{24}{x}\cdot\frac{3}{8}=\frac{3}{5}\)
\(\frac{24}{x}=\frac{3}{5}\div\frac{3}{8}\)
\(\frac{24}{x}=\frac{24}{15}\)
Vậy x = 15
b) Tương tự
Tim x:
x X 12 + x X 14 + x X 18 = \(\frac{21}{24}\)
x X (\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)) = \(\frac{21}{24}\)
x X (\(\frac{4}{8}+\frac{2}{8}+\frac{1}{8}\)) = \(\frac{21}{24}\)
x X \(\frac{9}{8}\)= \(\frac{21}{24}\)
x = \(\frac{21}{24}\): \(\frac{9}{8}\)
x = \(\frac{21}{24}\)X \(\frac{8}{9}\)
x = \(\frac{7}{9}\)
\(x\times\frac{1}{2}+x\times\frac{1}{4}+x\times\frac{1}{8}=\frac{21}{24}\)
\(\Rightarrow x\times\left[\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right]=\frac{21}{24}\)
\(\Rightarrow x\times\left[\frac{4+2+1}{8}\right]=\frac{21}{24}\)
\(\Rightarrow x\times\frac{7}{8}=\frac{21}{24}\)
\(\Rightarrow x\times\frac{7}{8}=\frac{7}{8}\)
\(\Rightarrow x=\frac{7}{8}:\frac{7}{8}=1\)
\(=\frac{4}{3}.\frac{9}{8}.\frac{16}{15}.\frac{25}{24}...\frac{100}{99}\)
\(1\frac{1}{3}\times1\frac{1}{8}\times1\frac{1}{15}\times1\frac{1}{24}\times...\times1\frac{1}{99}\)
\(=\frac{4}{3}\times\frac{9}{8}\times\frac{16}{15}\times\frac{25}{24}\times...\times\frac{100}{99}\)
\(=\frac{2\times2}{1\times3}\times\frac{3\times3}{2\times4}\times\frac{4\times4}{3\times5}\times\frac{5\times5}{4\times6}\times...\times\frac{10\times10}{9\times11}\)
\(=\frac{2}{1}\times\frac{10}{11}\)
\(=\frac{20}{11}\)
x : 0,25 + x . 11 = 24
x . 4 + x . 11 = 24
x (4 + 11) = 24
x . 15 = 24
x = 24 : 15
x = 1,6
Vậy x = 1,6
=))
=> x . 10 + x . 5 = 24
=> x . ( 10 + 5 ) = 24
=> x . 15 = 24
=> x = 24 : 15
=> x = 1,6
Tk mk nha
\(x:0,1+x.5=24\)
\(x:\frac{1}{10}+x\cdot5=24\)
\(x\cdot10+x\cdot5=24\)
\(x\cdot\left(10+5\right)=24\)
\(x\cdot15=24\)
\(x=\frac{24}{15}\)