Question

Tìm x

a, x/15 = 2/5

b, 3/x*7 = 27/135

 

Answer 1

Answer 2

a)\(\frac{x}{15}=\frac{2}{5}\)=> x=\(\frac{15.2}{5}=6\)

b) \(\frac{3}{x^7}hay\frac{3}{x.7}\)

Answer 3

a)\(\frac{x}{15}=\frac{2}{5}\Rightarrow x=\frac{2\cdot15}{5}=6\)

b)\(\frac{3}{x\cdot7}=\frac{27}{135}\Rightarrow x\cdot7=\frac{3\cdot135}{27}\Rightarrow x\cdot7=15\Rightarrow x=2\frac{1}{7}\)