Question

1

tìm X

X/2 + X/3 + X/4 =180

1/X x 2 + 2/ X x3 + 3/ X x 4=120

Answer 1

a/ \(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}=180\)

\(\Leftrightarrow x\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\right)=180\)

\(\Leftrightarrow\frac{13}{12}x=180\)

\(\Leftrightarrow x=\frac{2160}{13}\)

b/ \(\frac{1}{x.2}+\frac{2}{x.3}+\frac{3}{x.4}=120\)

\(\Leftrightarrow\frac{1}{x}\left(\frac{1}{2}+\frac{2}{3}+\frac{3}{4}\right)=120\)

\(\Leftrightarrow\frac{1}{x}.\frac{23}{12}=120\)

\(\Leftrightarrow\frac{1}{x}=\frac{1440}{23}\)

\(\Leftrightarrow x=\frac{23}{1440}\)

Answer 2

ý b của mik là 23/12