Tìm x biết:
a)\(\frac{-x}{4}\) = \(\frac{-9}{x}\)
b)\(\frac{12}{x+1}\) =\(\frac{5}{30}\)
c)\(\frac{x+42}{5}\) =\(\frac{5x+2}{20}\)
Loga
Toán lớp 6
Tìm x biết:
a)\(\frac{-x}{4}\) = \(\frac{-9}{x}\)
b)\(\frac{12}{x+1}\) =\(\frac{5}{30}\)
c)\(\frac{x+42}{5}\) =\(\frac{5x+2}{20}\)
